Question

find the derivative by using first principle method

Answer 1

Answer:

$\frac{dy}{dx} = \frac{f(x + h) - f(x)}{h} = \frac{ \cos(a(x + h)) - cos(ax) }{h} \\ \\ = \frac{ \cos(ax) \cos(ah) - \sin(ax) \sin(ah) - \cos(ax) }{h} = asin(ax)$

Answer 2

Answer:

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