(sin 0 + 1 + cos 0) (sin 0 - 1 + cos 0). sec 0 cosec 0 = 2
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Step-by-step explanation:
(sin+cos+1)(sin+cos-1)sec cosec
={(sin+cos)²-1}sec cosec
=(1+2sincos-1)/sincos
=2sincos/sincos
=2
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