I will assume that you are finding the derivative with respect to x.
let u = x^2/35 or u = (1/35)x^2
let y = sin u
dy/du = cos u , and du/dx = (2/35)x
dy/dx = (dy/du)(du/dx)
= (cos u)(2/35)x
= (2x/35)cos (x^2/35)
your aim will be to reach that final line directly.
How do you use u-substitution with 20sin(x^2/35)?
1 answer