Which set of steps can be used to prove the sine sum identity, sine of open paren x plus y close paren is equal to sine x plus cosine x ?

Question

Revolt · Accepted Answer

Use the supplementary relationship between sine and cosine to rewrite  sine of open paren x plus y close paren  as  cosine of open paren pi over 2 minus open paren x plus y close paren close paren . Apply the cosine sum identity. Then simplify using  sine of negative y is equal to negative sine times y  and  cosine of negative y is equal to cosine of y .

Trigonometric Sum Identities - Quiz Quiz

Which set of steps can be used to prove the sine sum identity, sine of open paren x plus y close paren is equal to sine x plus cosine x ?

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