( 1+ tan a + sec a) (1 + cot a - cosec a )
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Step-by-step explanation:
(1+tanA+secA)(1+cotA-cosecA)
=(cosA+sinA+1/cosA)(sinA+cosA-1/sinA)
=(cosA+sinA)²-1/sinAcosA
=cos²A+sin²A+2sinAcosA-1/sinAcosA
=2
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