1. sin0(cot0 + tan0) = sec0 2. cos0 +1/cos0 -1 = 1 + sec0/1 - sec0
sin x (cos x/sin x + sin x/cos x) = cos x + (sin^2/cos x) = [cos^2 x + sin^2 x]/cos x = 1/cos x = sec x You try the other one
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