cos (270°+thita) cos (90°-thita) sin (270°-thita) cos thita
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cos (270°+theta) cos(90° - theta) sin (270-theta) cos theta
= sin theta sin theta * -cos theta * cos theta
= - sin^2 theta * cos^2 theta
= sin theta sin theta * -cos theta * cos theta
= - sin^2 theta * cos^2 theta
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