5.2. November 30, 2012 Mrs. Poland. Verifying Trigonometric Identities
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1 5.2 Verifying Trigonometric Identities Verifying Identities by Working With One Side Verifying Identities by Working With Both Sides November 30, 2012 Mrs. Poland
2 Objective #4: Students will be able to verify trigonometric identities. SC #4: I can verify trigonometric identities by working with one side of an equation. SC #5: I can verify trigonometric identities by working with both sides of an equation.
3 Hints for Verifying Identities Learn the fundamental identities. Whenever you see either side of a fundamental identity, the other side should come to mind. Also, be aware of equivalent forms of the fundamental identities. Try to rewrite the more complicated side of the equation so that it is identical to the simpler side. It is sometimes helpful to express all trigonometric functions in the equation in terms of sine and cosine and then simplify the result.
4 Hints for Verifying Identities Usually, any factoring or indicated algebraic operations should be performed. For example, the expression can be factored as The sum or difference of two trigonometric expressions such as can be added or subtracted in the same way as any other rational expression.
5 Hints for Verifying Identities As you select substitutions, keep in mind the side you are not changing, because it represents your goal. For example, to verify the identity find an identity that relates tan x to cos x. Since and the secant function is the best link between the two sides.
6 Hints for Verifying Identities If an expression contains 1 + sin x, multiplying both the numerator and denominator by 1 sin x would give 2 1 sin x, which could be replaced 2 with cos x. Similar results for Caution 1 sin x, 1 + cos x, and 1 cos x may be useful. Verifying identities is not the same a solving equations. Techniques used in solving equations, such as adding the same terms to both sides, should not be used when working with identities since you are starting with a statement that may not be true.
7 Verifying Identities by Working with One Side To avoid the temptation to use algebraic properties of equations to verify identities, one strategy is to work with only one side and rewrite it to match the other side.
8 Example 1 VERIFYING AN IDENTITY (WORKING WITH ONE SIDE) Verify that is an identity. Work with the right side since it is more complicated. Right side of given equation Distributive property Left side of given equation
9 Example 2 VERIFYING AN IDENTITY (WORKING WITH ONE SIDE) Verify that Left side is an identity. Distributive property Right side
10 Example 3 VERIFYING AN IDENTITY (WORKING WITH ONE SIDE) Verify that is an identity.
11 Example 4 VERIFYING AN IDENTITY (WORKING WITH ONE SIDE) Verify that is an identity. Multiply by 1 in the form
12 Verifying Identities by Working with Both Sides If both sides of an identity appear to be equally complex, the identity can be verified by working independently on each side until they are changed into a common third result. Each step, on each side, must be reversible.
13 Example 5 VERIFYING AN IDENTITY (WORKING WITH BOTH SIDES) Verify that identity. Working with the left side: is an Multiply by 1 in the form Distributive property
14 Example 5 VERIFYING AN IDENTITY (WORKING WITH BOTH SIDES) (continued) Working with the right side: Factor the numerator. Factor the denominator.
15 Example 5 VERIFYING AN IDENTITY (WORKING WITH BOTH SIDES) (continued) Right side of given equation Left side of given equation Common third expression So, the identity is verified.
16 Classwork Page #33-41 odds
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