In this topic, I'm going to show how to count basic trigonometric equation for sine and cosine wave forms.

To make solving the equation easier, I will use the following trigonometric table.

Exercise 1.

Solve equation: in range

I going to draw the and

In range of (0,2) I have found two points where line is crossing the sine wave.
To find we have to look at table and check value for
We can find that

because range of is equal in length

Answer: and