If `y=x^4+tanx` then find y".

If y=(tanx)^(sinx) then find dy//dx .

If y=(2x+3)/(4x+5) then find y'' .

If y=x^4 then find the average rate of change of y between x= 2 and x= 4.

If x=cis alpha ,y=cis beta , then find x^4y^3+(1)/(x^4y^3)

If x=a and y= b is solution for the pair of equations x-y=2 and x+y=4, then find the values of a and b.

If y= sec (sqrt(tanx)) , find (dy)/(dx)

If Sin x Cosy = 1/4 and 3Tanx = 4 Tany then Sin (x - y) =