cot squared theta minus 1 by sin squared theta is equal to minus 1
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lhs
cot^2theta-1/sin^2theta
cos^2theta/sin^2theta-1/sin^2theta
cos^2theta-sin^2theta
rhs
-(1)
-(cos^2theta+sin^2theta)
-cos^2theta-sin^2theta
hence lhs=rhs (proved )
cot^2theta-1/sin^2theta
cos^2theta/sin^2theta-1/sin^2theta
cos^2theta-sin^2theta
rhs
-(1)
-(cos^2theta+sin^2theta)
-cos^2theta-sin^2theta
hence lhs=rhs (proved )
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