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(Secx/sinx)-(sinx/cosx)
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(Secx/sinx)-(sinx/cosx)

User EEM
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(\sec x)/(\sin x)-(\sinx )/(\cos x)=(\sec x\cos x)/(\sin x\cos x)-(\sin^2x)/(\sin x\cos x)=(1-\sin^2x)/(\sin x\cos x)=(\cos^2x)/(\sin x\cos x)=(\cos x)/(\sin x)=\cot x
User Juanmirocks
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