Question: Verify the following are identities. (a) sin u/csc u + cos u / sec u = 1 (b) 1 - cos2 x) (1 + cot2

Verify the following are identities.
(a) sin u/csc u + cos u / sec u = 1
(b) 1 - cos2 x) (1 + cot2 x) = 1
(c) sin t (csc t - sin t) = cos2 t
(d) 1 - csc2 t/ csc2 t = - 1 / sec2 t

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