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Esperoq ue te sirva, salu2!!!!
sen t ( 1 - sen t) = cos² t identidad csc t= 1/sen t
sen t
sen t ( 1-sen² t ) = cos² t
sen t
sen t ( cos² t) = cos² t identidad 1-sen² t=cos² t
sen t
se elimino sen t,porque multiplica y dividia a la vez
cos² t= cos² t