Algebra 2/Trigonometry 1



Pre-Calculus/Trigonometry 3 Name _____________________________________

5.4 Sum & Difference Formulas WS Date _________________ Block________

Use the sum and difference identities to find the exact value of each function.

1) cos 75( 2) cos 375(

3) sin (-165() 4) sin (-105()

5) sin 95( cos 55( + cos 95( sin 55( 6) cos 160( cos 40( + sin 160( sin 40(

Verify that each of the following is an identity.

7) cos (180( ( () = ( cos ( 8) sin (360( + () = sin (

9) cos ([pic]+ () = sin ( 10) sin([pic]( () = cos (

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