1/1-costheta+1/1+cos theta =2cosec^2 theta
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Answer:
1/1-costheta + 1/1+costheta
=> 1+costheta+1-costheta÷(1-costheta) (1+costheta) (taking LCM)
=> 2÷1-cos^2theta
=> 2÷sin^2 theta =2 cosec^2 theta=R.H.S
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