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Mathematics, 27.07.2019 06:30 naenae2cold12021
Which sum or difference identity would you use to verify that sin (90° + q) = cos q? a. cos (a -b) = cos a cos b + sin a sin b b. sin (a +b) = sin a cos b + cos a sin b c. sin (a -b) = sin a cos b- cos a sin b d. cos (a +b) = cos a cos b - sin a sin b
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Which sum or difference identity would you use to verify that sin (90° + q) = cos q? a. cos (a -b)...
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