What is cos 45 degrees in simplified radical form?

The value of cos 45 degrees in simplified radical form is 0.70710 approximately.

Solution:

Given, Cos of angle 45 degrees.

We have to find the value of the Cos of 45 degrees in radical form.

From trigonometric ratios,  

Cos of angle 45 degrees = cos ⁡45 =

Multiplying numerator and denominator with square root of 2

The value of square root of 2 is 1.414213

Hence, the value of Cos of angle 45 degrees is 0.70710 approximately

a is the right answer