What is $cos^2theta$ in terms of $sintheta$ ?

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Answer 1 · 2015-12-25T19:35:53

$cos^2theta=1-sin^2theta$

$color(white)xxsin^2theta+cos^2theta=1color(white)xx$ (Fundamental theorem of trigonometry)

$=>sin^2theta+cos^2thetacolor(red)(-sin^2theta)=1color(red)(-sin^2theta)$
$=>cos^2theta=1-sin^2theta$

What is cos^2thetacos^2theta in terms of sinthetasintheta?