Mathematics, 16.10.2019 06:30 rodriguezzamyy
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:
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reason:
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3.
2. use the trigonometric subtraction formula for sine to verify this identity:
sin((π / 2) – x) = cos x
calculation:
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reason:
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Answers: 3
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1. derive this identity from the sum and difference formulas for cosine:
sin a sin b =...
sin a sin b =...
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