Question: Verify that the following are identities (see Example 6). (a) (1 + sin z) (1 - sin z) = 1/ sec2 z (b) (sec t

Verify that the following are identities (see Example 6).
(a) (1 + sin z) (1 - sin z) = 1/ sec2 z
(b) (sec t - 1) (sec t + 1) = tan2 t
(c) Sec t - sin t tan t = cos t
(d) Sec2 t - 1/sec2 t = sin2 t

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