Question

can i know the value of sin and cos ?

Answer 1

To find the value of sin and cos, draw a circle of radius 1 inch or 1 cm (or just one unit) like this:

Draw a line at some angle counting the angle from the positive x-direction. To find the value of $\sin\theta$, draw a line from point A toward y-axis parallel to x-axis. The y-value is the value of $\sin\theta$.

Draw a vertical line from point A to x-axis. The x-coordinate is the value of $\cos\theta$.