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secA/cotA+tanA
=>1/cosA ÷ 1/cotA+tanA
=> cosA × cotA+tanA
=> cosA × ( cosA/sinA+sinA/cosA )
=>cosA × ( cos^2A+sin^2A/sinAcosA )
=>cosA× 1/ sinA cosA
=> 1/sinA
and 1/sinA can be also written as cosecA
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