Question
Differentiate the function with respect to x : $\sin \left( {ax + b} \right)$

Answer

Let $y = \sin \left( {ax + b} \right)$ 

$\therefore \frac{{dy}}{{dx}} = \cos \left( {ax + b} \right)\frac{d}{{dx}}\left( {ax + b} \right)$

$= \cos \left( {ax + b} \right)\left( {a + 0} \right)$

$ = a\cos \left( {ax + b} \right)$

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