(seco-1) (coseco-1) = 1
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Step-by-step explanation:
LHS
=(secx-1) (cosecx-1)
=secx*cosec x - secx - cosec x +1
= 1/sin x*cosx - (sinx+cosx)/sinx*cosx +1
=(1-sinx-cosx)/sinx.cosx +1
=(1-sinx-cosx + sinx. cosx)/sinx.cosx
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