1.

Evaluate each of the following:(i) cot-113-cosec-1-2+sec-123(ii) cot-12cossin-132(iii) cosec-1-23+2cot-1-1(iv) tan-1-13+cot-113+tan-1sin-π2

Answer» Evaluate each of the following:



(i) cot-113-cosec-1-2+sec-123



(ii) cot-12cossin-132



(iii) cosec-1-23+2cot-1-1



(iv) tan-1-13+cot-113+tan-1sin-π2


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