Hi!

I´m really mostly curios about how I can simplify after I differentiate.

$\displaystyle y = sin^2(ax) \ \mbox{is given} $

Decide the value ofaif $\displaystyle \frac{dy}{dx} \ = 1 \ \mbox{when} \ x = \frac{\pi}{4} $

Is this differentiation correct? $\displaystyle \frac{dy}{dx} = 2a*sin(ax)*cos(ax) $ ?

Now, can I rewrite this using the trig.identity $\displaystyle 2*sin(x)*cos(x) = sin (2x) $ ?

How would it look like in that case?

Thanks