Derivatives of polynomial and trigonometric functions

Example:  Compute derivative of f(x) = sin 2x

Ans: f’(x) =

= 2sinx(-sinx) + 2cosx cosx

= -2sin2x + 2cos2x

= 2 cos2x

Examples: 

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3. (3x + 5) (1 + tan x)

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4. (sec x – 1) (sec x + 1)

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