cos 90-theta sin theta
cos 90-theta sin theta, sin 90 theta cos theta, sin 90 + theta is equal to cos theta, sin theta is equal to cos 90 - theta, cos 90-theta is equal to sin theta
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cos 90-theta sin theta
sin 90 theta cos theta
sin 90 + theta is equal to cos theta
sin theta is equal to cos 90 - theta
cos 90-theta is equal to sin theta
cos 90-theta sin theta, sin 90 theta cos theta, sin 90 + theta is equal to cos theta, sin theta is equal to cos 90 - theta, cos 90-theta is equal to sin theta