g (x) = (3xe x ) = 3(xe x ) (const. mult.) = 3 ((x) e x + x(e x ) ) (product rule) = 3(e x + xe x ) = 3e x (1 + x)

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1 1. f() = Solution: Just use the power rule: f () = g() = 3e Solution: g () = (3e ) = 3(e ) (const. mult.) = 3 (() e + (e ) ) (product rule) = 3(e + e ) = 3e (1 + ) 3. h() = ln( 2 + ) Solution: Use the chain rule with the outer function f() = ln() and inner function g() = 2 +. Then h() = ln( 2 + ) = f(g()), and the chain rule says h () = f (g()) g () = (2 + 1) = () = 3 3 e 7 = 3e 7 3 Solution: Since 3e 7 is just a constant, use the power rule: t () = 9e n() = Solution: n () = ( + 1) ( 1) ( + 1)( 1) ( 1) 2 (quotient rule) 1 ( 1) ( + 1) 1 = ( 1) 2 = 2 ( 1) 2 1

2 6. a(t) = te t2 Solution: First, by the product rule, we have a (t) = (t) e t2 + t(e t2 ) = e t2 + t(e t2 ) So we just need to compute (e t2 ), the derivative of e t2. To do so, use the chain rule, with outer function f(t) = e t and inner function g(t) = t 2. Then e t2 = f(g(t)), and so (e t2 ) = f (g(t)) g (t) = e t2 2t So finally we have a (t) = e t2 + t(e t2 ) = e t2 + 2t 2 e t2 7. f(u) = u 2 ln(1 + e u ) Solution: First, use the quotient rule to get f (u) = (u2 ) ln(1 + e u ) u 2 (ln(1 + e u )) (ln(1 + e u )) 2 = 2u ln(1 + eu ) u 2 (ln(1 + e u )) (ln(1 + e u )) 2 To evaluate the derivative of ln(1 + e u ), use the chain rule with outer function F (u) = ln(u) and G(u) = 1 + e u to get (ln(1 + e u )) = F (G(u)) G (u) = e u eu So finally we have f (u) = 2u ln(1 + eu ) u 2 e u 1+e u (ln(1 + e u )) 2 Page 2

3 8. g() = e Solution: Use chain rule with outer function f() = e and inner function h() = : g () = f (h()) h () = e h () To compute h (), use the chain rule again, with outer function F () = 4 = 1/4 and inner function G() = : So, all together, we have h () = F (G()) G () = 1 4 ( ) 3/4 ( ) g () = e h () = 1 4 e ( ) 3/4 ( ) 9. h(y) = 1 (7y) 2 Solution: First, square the bottom to make things simpler: h(y) = y 2 = 1 49y 2 = 1 49 y 2 Now just use the power rule: h (y) = 2 49 y 3 = 2 49y 3 Page 3

4 10. s() = ( ) ln() e 3 + Solution: Let f() = ( ) ln() be the numerator. Then the quotient rule tells us that To compute f (), use the product rule s () = f ()(e 3+ ) f()(e 3 + ) (3 3 + ) 2 = f ()(e 3+ ) f()(3e 3 + 1) (3 3 + ) 2 f () = ( ) ln() + ( )(ln()) = ( ) ln() Finally, plug this back into our formula for s (): s () = f ()(e 3+ ) f()(3e 3 + 1) (3 3 + ) ( 2 ) ( ) ln() (e 3+ ) ( ) ln()(3e 3 + 1) = (3 3 + ) f(r) = (r 2 + r) 100 Solution: Just use the chain rule with outer function g(r) = r 100 and inner function h(r) = r 2 + r: f (r) = g (h(r)) h (r) = 100(r 2 + r) 99 (2r + 1) 12. g(p) = (3p 2 + p + 1)e p ln(p) Solution: From the product rule, we have g (p) = (3p 2 + p + 1) e p ln(p) + (3p 2 + p + 1)(e p ) ln(p) + (3p 2 + p + 1)e p (ln(p)) = (6p + 1)e p ln(p) + (3p 2 + p + 1)e p ln(p) + (3p2 + p + 1)e p p 13. h() = ( )(4 ) ln() Solution: Since this just a fraction, we use the quotient rule: h () = [( )(4 )] ( ln()) ( )(4 )( ln()) ( ln()) 2 Page 4

5 Now we just need to compute the two derivatives [( )(4 )] and ( ln()). Use the product rule for both, and we get [( )(4 )] = ( ) (4 ) + ( )(4 ) = (2 + 1)4 + ( ) ln(4)4 and ( ln()) = () ln() + (ln()) = ln() + = ln() + 1 Now plug these back into our original equation: h () = [(2 + 1)4 + ( ) ln(4)4 ]( ln()) ( )(4 )(ln() + 1) ( ln()) t() = ln( 2 + 3)e 2 Solution: The function is the product of the two functions ln( 2 +3) and e 2, so use the product rule: t () = (ln( 2 + 3)) e 2 + ln( 2 + 3)(e 2 ) To compute the derivative of ln( 2 + 3), use the chain rule, where the outer function is ln() and the inner function is to get (ln( 2 + 3)) = To compute the derivative of e 2, also use the chain rule, where the outer function is e and the inner function is 2, to get (e 2 ) = e 2 (2 1) Now put it all together to get t () = e + ln( 2 + 3)e 2 (2 1) 15. n() = 1 ln() + Solution: There are two ways to do this problem: (a) Use quotient rule (b) Use the chain rule where the outer function is 1 and the inner function is ln() +. We will do it both ways. First: (a) Use the quotient rule: n () = (1) (ln() + ) 1 (ln() + ) (ln() + ) 2 Page 5

6 Since the derivative of the constant function 1 is zero, this gives The alternative way is: n () = ( 1 + 1) (ln() + ) 2 (b) Use the chain rule. The outer function is 1 and the inner function is ln()+. Since the derivative of 1 1 is, this gives 2 ( ) n 1 1 () = (ln() + ) q(p) = p(p 3 + p + e p ) Solution: We could use the product rule right away, but let s multiply it out first: q(p) = p 4 + p 2 + pe p We still have to use the product rule on the last term, but now we can just use the power rule for the first two terms: q (p) = 4p 3 + 2p + (pe p ) = 4p 3 + 2p + e p + pe p 17. f(u) = e7 + ln(2) + 1 u 1 Solution: Write 1 u as u 1 : f(u) = (e 7 + ln(2) + 1)u 1 1 The derivative of the constant -1 is zero, and just use the power rule for the first term f (u) = (e 7 + ln(2) + 1)u 2 = (e7 + ln(2) + 1) u g() = Solution: Just use the chain rule with outer function and inner function : g () = h(y) = e 5y + ln(2y) + 1 y 5 Page 6

7 Solution: For the derivative of e 5y use the chain rule with outer function e y and inner function 5y to get (e 5y ) = 5e 5y For the derivative of ln(2y), use the chain rule with outer function ln(y) and inner function 2y: (ln(2y)) = 2 2y = 1 y Put it together (using just the power rule on the last term) to get h (y) = 5e 5y + 1 y 5 y s(t) = t3 + 7t + 1 t Solution: Use the quotient rule: s (t) = (t3 + 7t + 1) t (t 3 + 7t + 1)(t) t 2 = (3t2 + 7)t (t 3 + 7t + 1) t f() = ln ( e ( 2 + 1) ) Solution: We have to use the chain rule with outer function F () = ln() and inner function G() = e ( 2 + 1). So f () = F (G()) G () We know that F () = 1, but for G (), we must use the product rule: G () = (e ) ( 2 + 1) + e ( 2 + 1) = e ( 2 + 1) + e (2) = e ( ) = e ( + 1) 2 Now put it all together: f () = e ( + 1) 2 ( + 1)2 e ( 2 = + 1) g() = e (2 +3) 7 ( 1) 5 Solution: We must of course use the chain rule, with outer function e and inner function ( 2 + Page 7

8 3) 7 ( 1) 5. The derivative of the inner function (using both product and chain rules) is [( 2 + 3) 7 ( 1) 5 ] = 7( 2 + 3) 6 (2)( 1) 5 + ( 2 + 3) 7 5( 1) 4 = ( 2 + 3) 6 ( 1) 4 ( 14( 1) + 5( 2 + 3) ) ( factor) = ( 2 + 3) 6 ( 1) 4 ( ) Use what we just found plus the chain rule (with the original function) to get g () = e (2 +3) 7 ( 1) 5 ( 2 + 3) 6 ( 1) 4 ( ) 23. h() = ln() ln ( ) 1 Solution: For the derivative of ln ( 1 ), use the chain rule: ( ln So the derivative of the original function is ( 1 = )) 1 1 = 2 = h () = = t() = (2 5) Solution: Use the product rule t () = () ( 2 5) + ( 2 5) = (2) 25. n() = ( + 1) 4 ( 1) 4 3 Solution: Use the product rule, and then the chain rule: n () = [( + 1) 4 ] ( 1) ( + 1) 4 [( 1) 4 ] 3 + ( + 1) 4 ( 1) 4 [ 3 ] = 4( + 1) 3 ( 1) ( + 1) 4 ( 1) ( + 1) 4 ( 1) a(t) = t2 1 e 2t 1 Page 8

9 Solution: Use the quotient rule: a (t) = (t2 1) (e 2t 1) (t 2 1)(e 2t 1) (e 2t 1) 2 = 2t(e2t 1) (t 2 1)2e 2t (e 2t 1) f(u) = u 4 ln(1 + e u ) Solution: Use the quotient rule (and the chain rule for the derivative of the denominator): 28. g() = 2 + ln() + 1 f (u) = (u4 ) ln(1 + e u ) u 4 (ln(1 + e u )) ln(1 + e u ) 2 = 4u3 ln(1 + e u ) u 4 e u 1+e u ln(1 + e u ) 2 Solution: Use the chain rule with outer function F () = and inner function G() = 2 + ln()+1 : To compute G (), use the quotient rule: g () = F (G()) G () = G () ln()+1 G () = (2 + 1)(ln() + 1) (2 + ) 1 (ln() + 1) 2 Plug this in for G () in the first formula to get the final answer. 29. s(t) = 1 t Solution: Since t = t if t is positive and t = t if t is negative, we can think of the function as a piecewise function: 1 t for t > 0 s(t) = 1 t for t < 0 To take the derivative, just differentiate the pieces : 1 s t for t > 0 (t) = 2 1 t for t < 0 2 Page 9

10 30. h(y) = y 2 Solution: Since y 2 0 for any value of y, the absolute value bars are unnecessary, and h(y) = y 2 So the derivative is just h (y) = 2y Page 10

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