Use the triangle below to find cos V.

Step-by-step explanation:

Given

The attached triangle

Required

Find cos V

In trigonometry:

In this case:

Where

and

-- Pythagoras

Take square roots

So:

Rationalize:

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square