Cosec(75+a)-cosec{90-(15-a)}-tan(55+a)+tan{90-(35-a)}
=Cosec(75+a)-cosec(75+a)-tan(55+a)-tan55+a)
=0
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Cosec(75+a)-cosec{90-(15-a)}-tan(55+a)+tan{90-(35-a)}
=Cosec(75+a)-cosec(75+a)-tan(55+a)-tan55+a)
=0