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Explanation & Answer
L.H.S=sec^2(pi/2-x)-1
but we know sce(pi/2-x)=cosecx
then
sec^2(pi/2-x)=cosec^2(x)
then
LHS=cosec^2(x)-1
but we know cosec^2(x)-1=cot^2(x)
then
LHS=cot^2(x)
so
L.H.S=R.H.S
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