cosecA (1+cosA) (cosecA-cotA)
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cosecA (1+cosA) (cosecA-cotA)
= (1/sinA) (1+cosA) (1/sinA - cosA/sinA)
= (1/sinA) (1+cosA) (1-cosA)/(sinA)
= (1-cos^2A) / (Sin^2A)
= (Sin^2A) / (Sin^2A)
= 1 (ans.)
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