Mathematics, 31.01.2020 00:47, rose3358

1. derive this identity from the sum and difference formulas for cosine:

sin a sin b = (1 / 2)[cos(a – b) – cos(a + b)]

calculation reason
1. 1.
2. 2.
3. 3.

Answers: 3

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1. derive this identity from the sum and difference formulas for cosine:

sin a sin b =...