Integral of Cosec(x)/Sec(x) (i.e. Use of trignometric identities)
∫ Cosec (x)/Sec (x) dx∫ [1/Sin (x)]/ [1/Cos (x)] dx∫ [1/Sin (x)] * [Cos (x)] dx∫ Cot (x)= ln [Sin (x)] + c
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