If ` x sec theta , y = tan theta ` , then the value of ` (d^(2) y)/(dx^(2)) " at " theta = (pi)/(4)` is

If x=2 cos theta-cos 2 theta and y=2 sin theta-sin 2 theta , then the value of (d^(2)y)/(dx^(2)) at theta=(pi)/(2) is -

If x=a cos^(3)theta and y=a sin^(3)theta, then find the value of (d^(2)y)/(dx^(2)) at theta=(pi)/(6)

If x= a sec theta ,y =a tan theta ,then " at " theta = (pi)/(4) ,(d^(2)y)/(dx^(2) ) =

If x=a(cos theta+log(tan((theta)/(2))) and y=a sin theta then find the value of (d^(2)y)/(dx^(2)) at theta=(pi)/(4)

If x = sin theta, y = sin^(3) theta then (d^(2)y)/(dx^(2)) at theta = (pi)/(2) is …….

If x =a sec theta, y =b tan theta then (dy)/(dx) =

If x=acos^3theta and y=asin^3theta, then find the value of (d^2y)/(dx^2) at theta=pi/6dot