Differentiate trigonometric function y cos4x39x

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=tMJRWkqZ6As

This calculus video shows how to differentiate a trigonometric function y=cos(4x^3+9x) using chain rule differentiation hack when it is a cosine function y’ = d/dx cos(f(x) = -f’(x)sin(f(x)). • #maths #calculus #trigonometricfunctions #differentiation #derivative #chainrule #cosine #sine #x #d/dx

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