cosec square plus cot square =1
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=1/sin^2x + cos^2x/sin^2x
=1+cos^2 x/sin^2 x
=1+cos^2 x/1-cos^2 x
=(1+cosx)(1+cosx)/(1-cosx)(1+cosx)
=(1+cosx)/(1-cosx)
=1+cos^2 x/sin^2 x
=1+cos^2 x/1-cos^2 x
=(1+cosx)(1+cosx)/(1-cosx)(1+cosx)
=(1+cosx)/(1-cosx)
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