1. ## y=asin(bx+c)+d

One of the questions is
y=-4sin2(x+pi/2)

how do i get it into this form
y=asin(bx+c)+d

Thanks

2. Is that $-4sin(2(x+\frac{\pi}{2}))?.$

Sometimes posters will not use ^ for power and write something like x2 for x^2. You do not mean $-4sin^{2}(x+\frac{\pi}{2})?.$

3. i double checked the question it is correct

4. $-4sin(2(x+\frac{\pi}{2}))$

If the question really says that it is already in the required form, just expand the brackets to get

$-4sin(2x+\pi)$