Using mathematical induction prove that ddx(xn)=nxn−1 for all positive integers n.
diffrentiate tan under root x w.r.t x using the first priciple
Prove that:
n! / r! x (n-r)! + n! / (r-1)! x (n-r+1) = (n+1)! / r! x (n-r+1)!