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Let y = arctan(x). Then x = tan(y).

Differentiate using the chain rule and rearrange: d(x)/dx = d(tany)/dx So 1 = sec^2(y) * dy/dx dy/dx = 1/sec^2(y)

But from identity sin^2(y) + cos^2(y) = ...

As all Spanish nouns are classified as either masculine and feminine, I have found several ways of learning how to easily remember and be able to recognise the gender of a noun when I see it written down ...

[Draw Diagram] We are given the inital velocity u=11.2m/s and we know the acceleration due to gravity is 9.8m/s^2. We need to find the distance 's'. When the stone is at its highest point the velocity wil...

There are several things I try to bear in mind when coming to write a French essay- some which apply to essay writing in general, and others specific to writing in French. Firstly I have found that it is ...

In the light-dependent reactions, a photon of light hits an electron located in the thylakoid membrane of the chloroplast in photosystem II. This causes the electron to gain energy and jump to a higher en...