Question

find the derivative.
plz

Answer 1

Given x = acostheta

$\frac{dx}{dtheta} = \frac{d}{dtheta}(a cos theta)$

                                   $= a \frac{d}{dtheta} (costheta)$

                                   $= a(-sintheta)$

                                   -asintheta.

Hope this helps!

Answer 2

x=acos theta +a theta sin theta
(dx/dtheta) = d(a costheta +atheta sin theta )/d theta
= -a sin theta + a cos theta  -----Anssss