1+cot^2a/cota=2cosec2a
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1+(cos^2a/sin^2a)/(cosa /sina)
(sin^2a+cos^2a)/sinacosa
1/cosasina
(since sin2a=2sinacosa)
=>2/sin2a
=>2cosec2a
(sin^2a+cos^2a)/sinacosa
1/cosasina
(since sin2a=2sinacosa)
=>2/sin2a
=>2cosec2a
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