Question: following identities: (If it is a one step problem please state the formula used) a) sin (+x) = cos(x) b) sin (x) cot (x)

following identities: (If it is a one step problem please state the formula used) a) sin (+x) = cos(x) b) sin (x) cot (x) = cos(x) c) cot2 (x) + sec (x) = tan (x) + csc (x) d) sin (x) sin (y) = sin (x + y) sin (x - y) -

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