Question

guys please telle the answer of COS315° =​

Answer 1

Answer:

1/√2 is the answer

Step-by-step explanation:

Given that : Cos 315°

It can be written as cos (360°-45°)

We know that Cos(360°-A)=Cos A

now, Cos 315°

=>cos (360°-45°)

=>Cos 45°

=> 1/√2

Answer 2

$=> \cos {45}^{o}$

$= \frac{1}{ \sqrt{2} }$