# Is arctan(x) = cot(x) true?

##### 1 Answer

Oct 23, 2015

No.

#### Explanation:

In general,

On the other hand,

So, you have that, **as a function**, **composing** the two functions results in the identity function. In formulas,

Instead, **as a number** (i.e. you must fix **multiplying** the two numbers gives one as a result: