If `y=1-costheta,x=1-sintheta,"then "(dy)/(dx)" at "theta=(pi)/(4)" is"`

If x=sintheta+thetacostheta,y=costheta-thetasintheta," then "((dy)/(dx))" at "theta=(pi)/(2) is

If x=costheta(1+costheta),y=sintheta(1+costheta)," then "((dy)/(dx))" at "theta=(pi)/(2) is

If x=ae^(theta)(sintheta-costheta),y=ae^(theta)(sintheta+costheta)," then "((dy)/(dx))" at "theta=(pi)/(2) is

If x=a(theta+sintheta),y=a(1+sintheta), then (dy)/(dx) at theta=pi/3 is :

x=3costheta-2cos^(3)theta,y=3sintheta-2sin^(3)theta" then find dy/dx at "theta=(pi)/(4)

If y=a(theta+sintheta),x=a(1-costheta)," then "(dy)/(dx)=

If x=2costheta-cos2theta,y=2sintheta-sin2theta,"find "dy/dx" at "theta=pi/2 .

If x=a(costheta+log"tan"(theta)/(2)) and y=asin theta , then find the value of (dy)/(dx) at theta=(pi)/(4) .

If x=a(theta-sintheta),y=a(1-costheta) then (dy)/(dx)=

If x=a(theta-sintheta) and, y=a(1+costheta) , find (dy)/(dx) at theta=pi/3 .