Trig Identities Lesson 3

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Presentation transcript:

Trig Identities Lesson 3 Obj – Cofunctions - Sum & Difference Identities

What are cofunctions? So, what do you notice about the functions?

(Functions that are equal when their Angles add up to 90 degrees.) Cofunctions – Complementary Functions (Functions that are equal when their Angles add up to 90 degrees.)

Sum & Difference Identities

EX 1: Use reference triangles to find exact values for: A. B. C. D. E. F.

4 (B)

Ex. 5: Use your knowledge of cofunctions or sum/difference identities to find the value of the unknown angle or function. A. B. C. D.

EX 7: Find the exact value of

EX 8: Find the exact value of

Ex. 9: Find the exact value of the Sine, Cosine, and Tangent of the following angle.

Ex. 10: For and , find: A. B. C.

Ex. 11: For and , find: A. B. C.

HW (Trig Identities Lesson 3 Worksheet)