Question

Find the slope of the graph y=5sinx at x=pi/2

Answer 1

$\bf y=5sin(x)\qquad \cfrac{dy}{dx}=5cos(x) \\\\ x=\frac{\pi }{2}\implies \cfrac{dy}{dx}=5cos\left( \frac{\pi }{2}\right)\to 5\cdot 0\to 0$