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" (12) "(cos2 theta)/(1+sin2 theta)=tan(...

" (12) "(cos2 theta)/(1+sin2 theta)=tan((pi)/(4)-8)

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Prove that: (a) (sin 2 theta)/(1+cos 2 theta)=tan theta (b) (1+sin 2 theta+cos 2theta)/(1+sin2 theta-cos 2 theta)=cot theta