# How do you prove #Sinx+cosx=1#?

##### 1 Answer

Mar 5, 2016

it is

#### Explanation:

Just imagine any rectangle triangle. Take one of its acute angles.

The sine of this angle is the opposite catet dividing by the hypotenuse (a/h), and the cosins of this angle is the adjacent catet dividing by the hypotenuse (b/h)

So

But by the Pythagoras theorem we know that the sum of the square of the catets

So