Parametric Derivative:
Let a function y = Ø(x) be shown by means of parametric equations x = ƒ(t), y = g (t); where t is a parameter. Suppose that ƒ(t) and g (t) have derivatives and that the function x = ƒ(t) possesses the inverse function t = h (x). The provided function y = Ø(x) can be regarded as a function of a function:
y = g (t) where t = h (x)
Example: Calculate dy/dx, when
x = a (cos t + log tan t/2)
y = a sin t
