Find `dy/dx`, when `x^2+y^2=4`.

Find (dy)/(dx) , when: x^(2)+y^(2)=log(xy)

Find (dy)/(dx) if x^2+y^2=4xy

Find (dy)/(dx) , when: (x^(2)+y^(2))^(2)=xy

Find (dy)/(dx) , when y=x^(2)+4x^(-1//2)-3x^(-2)

Find (dy)/(dx) , when: xsin2y=ycos2x

Find (dy)/(dx), when x=at^(2) and y=2 at

Find dy/dx when x=4t,y=4/t .

Find (dy)/(dx) when x=4t , y= 4/t

Find dy/dx when 2x+3y=cosx .

Find (dy)/(dx) , when If y = (cos x + sinx)/(cos x - sinx) , show that (dy)/(dx) = sec^(2) (x + (pi)/(4)) .