jazerbonniel jazerbonniel

15-05-2016
Mathematics

Answered

Rewrite with only sin x and cos x.

cos 2x - sin x

Select one:

Acos2x - sin2x - sin x
Bcos2x - sin3x
Ccos2x + sin2x + sin x
Dcos2x - 3 sin x

Verified Answer :

19-04-2017

The answer is a. cos2x - sin2x - sin x. Use the rule: cos2x = (cos^2)x - (sin^2)x. So, substitute cos2x in the expression: cos2x - sinx = ((cos^2)x - (sin^2)x) - sinx = (cos^2)x - (sin^2)x - sinx. Therefore, choice a. is correct choice.

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