No links please Q. If x = 2 cos θ - cos 2 θ ; y = 2 sin θ - sin 2 θ ; find the value of d 2 y d x 2 a t θ = π 2 Share with your friends Share 0 Varun Rawat answered this d2ydx2 = 32sec23θ2×dθdx⇒d2ydx2 = 32sec23θ2×1-2sin θ + sin 2θ⇒d2ydx2 = -34sec23θ2×1sin θ + sin 2θ⇒d2ydx2θ=π2 = -34sec23π4×1sin π2+ sin π=-34×2×11+0=-32 0 View Full Answer