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" 21."(" i) "(cos^(2)theta(1-cos theta))...

" 21."(" i) "(cos^(2)theta(1-cos theta))/(sin^(2)theta(1-sin theta))=(1+sin theta)/(1+cos theta)

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cos theta/(1+sin theta)=(1-sin theta)/cos theta

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prove that (cos theta)/(1-sin theta)+(cos theta)/(1+sin theta)=(2)/(cos theta)