If y=e^-x cos x then y₄=

If ay⁴=(x+b)⁵then 5yy₂=1

d/dx{Tan^-1(a+bcos x/b+a cos x)}=

d/dx{x√a²+x²+a²Sinh^-1(x/a)}=

d/dx{log(x²/e^x)}=

If y= a cos x+(b+2x)sinx then y₂+y=

d/dx{√(1+sin x/1-sin x)}=

If y²=4ax then 4a(1+y₁²)^3/2+(y²+4a²)^3/2y₂=

If y=(1+x²)Tan^-1x then y₂=

If r²=x²+y²,x=e^t sin t,y=e^t cos t then dr/dt=