# How do you evaluate sine, cosine, tangent of #pi/4# without using a calculator?

##### 2 Answers

#### Explanation:

Hence

Now, you can find the sine, cosine and tangent without a calculator!

You should obtain

Sin and cosine:

Tangent:

I am assuming you are familiar with the formula SOH CAH TOA, yes?

Start by drawing a right triangle in Quadrant I, with a

#### Explanation:

The

I teach that

Take the square root of both sides:

If each side =