Which mathematician came up with the derivative of sin of x equals cos of x? [d/dx sinx= cosx]?

Question

I'm working on something for my calculus class, and I need to figure out which mathematician derived the derivative of sin of x, to equal cos x.

d/dx sin x = cos x

I need the answers by tomorrow night, I tried looking everywhere online, but no such luck.

Thanks in advance!

Answer 1

Issac Newton, the guy who invented calculus

Addendum: So, I get 2 thumbs down? Okay, read on:

Here's a link talking about Newton's "Transcendental Calculus". Even though his fluxion methods seem clumsy to us today, he fully understood that the derivative of Sine was Cosine and vice versa. He wouldn't have been able to complete his "Principia Mathematica" with studies on planetary motion if he didn't know about "fluxion" properties of trigonmetric functions.

Now if you want to get argumentive, it's been said that certain Indian mathematicians actually worked on this problem prior to Newton, but they failed to develop a cohesive methodology of calculus.