What is $3costheta$ in terms of $sintheta$ ?

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Answer 1 · 2015-12-26T12:07:02

$3sqrt(1-sin^2(theta))$

We know that $cos^2(theta) + sin^2(theta) = 1$ . So $cos^2(theta) = 1 - sin^2(theta)$ and $cos(theta) = sqrt(1-sin^2(theta))$ .

You multiply this equality by 3 and you find out that $3cos(theta) = 3sqrt(1-sin^2(theta))$

What is 3costheta3costheta in terms of sinthetasintheta?