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Which sum or difference identity would you use to verify that sin (90° + q) = cos q? cos (a - b) = cos a cos b + sin a sin b sin (a + b) = sin a cos b + cos a sin b sin (a - b) = sin a cos b - cos a sin b cos (a + b) = cos a cos b - sin a sin b |
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Answer» Which sum or difference identity would you use to verify that sin (90° + q) = cos q? Solution: |
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