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26-10-2022
Mathematics

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A student uses the following steps to prove the sine sum identity. The proof is incorrect.

A 2-column table with 5 rows. Column 1 has entries step 1, step 2, step 3, step 4, step 5. Column 2 has entries sine (x + y), cosine (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) cosine (negative y) + sine (StartFraction pi Over 2 EndFraction minus x) sine (negative y), sine (x) cosine (y) + cosine (x) sine (y).

Which step is incorrect?

Step 2
Step 3
Step 4
Step 5

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