Question

What is the value of cos^2(90°)?
[Read as cosine squared 90 degree]

Answer 1

Cos^2(90)=cos(90)cos(90)
=0×0
=0

Answer 2

Answer:

$\cos^2 (90^\circ)=0$

Step-by-step explanation:

Given : The expression $\cos^2(90^\circ)$

To find : The value of the given expression?

Solution :

We know,

$\cos (90^\circ)=0$

We can re-write the given expression as,

$\cos^2(90^\circ)$

$=\cos (90^\circ)\times \cos (90^\circ)$

Substituting the value,

$=0\times 0$

$=0$

Therefore, $\cos^2 (90^\circ)=0$