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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 ...

With the subject: The past participle only agrees with the subject of the sentence when the auxiliary (auxiliaire in French) is the verb ‘être’. When the auxiliary ‘avoir’ is used, the past participle nev...