Question: Prove each differentiation rule. (a) d/dx [sec x] = sec x tan x (b) d/dx [csc x] = csc x cot x (c) d/dx [cot

Prove each differentiation rule.

(a) d/dx [sec x] = sec x tan x

(b) d/dx [csc x] = −csc x cot x

(c) d/dx [cot x] = −csc2 x

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