Sections 14.6 & 14.7.  Negative angle identities: ** the reciprocal functions act in the same way (csc, cot- move the negative out front; sec- can drop.

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Presentation transcript:

Sections 14.6 & 14.7

 Negative angle identities: ** the reciprocal functions act in the same way (csc, cot- move the negative out front; sec- can drop the negative entirely)

 Cofunction identities:

 Angle Sum Identities:  Angle Difference Identities:

 Double-Angle Identities:

 Half-Angle Identities:

 Find the exact values of the following by using either an angle sum or difference identity: A. sin 195° B. cos 165° C. tan (-300°) D. sin 345°

 Find the exact values of each of the following using a double-angle identity: A. sin 120° B. cos 480° C. tan (-630°)

 Find the exact values for each of the following using a half-angle identity: A. sin 75° B. cos 67.5° C. tan 112.5°

 pg. 810, #’s 3, 4, 5, 7, 8, 13, 15, 16, 17, along with the following problems (use a sum/difference identity for these): - sin 240° - sin (-105°) - cos 15° - tan 285° - cos 390° - tan (-75°)