$\"\"$

The trigonometric function is $\"\"$ .

Consider $\"\"$ .

Rewrite the function as $\"\"$ .

Apply half-angle formula : $\"\"$ .

$\"\"$ \ \

$\"\"$

Graph :

Draw a coordinate plane.

Graph the function $\"\"$ in the interval $\"\"$ .

$\"graph$

Observe the graph of the function :

The graph of $\"\"$ is reflection about the x - axis and shifts 1 unit upwards from the graph of $\"\"$ .

$\"\"$

Graph of the function $\"\"$ is :

$\"graph$