Question: Use identity (9) in Sec. 34 to show that (a) 1 + tan2 z = sec2 z; (b) 1 + cot2 z = csc2 z.

Use identity (9) in Sec. 34 to show that
(a) 1 + tan2 z = sec2 z;
(b) 1 + cot2 z = csc2 z.

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