English, 17.12.2021 01:10, catchi7484

Please help me with a precalc assignment! Given: A. sin(x) B. cos(x) C. cos(y) D. sin(y)

Use the drop-down menus in the derivation of the cosine sum identity:

sin(x + y)

= cos (StartFraction pi Over 2 EndFraction minus (x + y))

= Cosine ((StartFraction pi over 2 EndFraction minus x) minus y)

= Cosine (StartFraction pi Over 2 EndFraction minus x)

✔ C

+ Sine (StartFraction pi Over 2 EndFraction minus x)

A B C D

= sin(x)cos(y) + cos(x)sin(y)

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Please help me with a precalc assignment! Given: A. sin(x) B. cos(x) C. cos(y) D. sin(y)