Find the derivative of the trigonometric function using the Chain Rule.
y=cos✓x

If y = cos(√x), then by the chain rule

dy/dx = d/dx [cos(√x)]

dy/dx = - sin(√x) d/dx [√x]

dy/dx = - sin(√x) (1 / (2√x))

dy/dx = - 1/2 sin(√x) / √x

step-by-step explanation:

∆abc has the points a(1, 7), b(-2, 2), and c(4, 2) as its vertices. formed with the point d(1, 2) as its third vertex, then ∆abd is triangle.