$\"\"$

Pythagorean identity : $\"\"$ .

$\"\"$

The trigonometric function is $\"\"$ .

Apply reciprocal identity : $\"\"$ .

$\"\"$

The trigonometric function is $\"\"$ .

Apply reciprocal identity : $\"\"$ .

Thus, $\"\"$ .

The trigonometric function is $\"\"$ .

$\"\"$ .

The trigonometric function is $\"\"$ .

Apply reciprocal identity : $\"\"$ .

$\"\"$

The trigonometric functions are $\"\"$ , $\"\"$ , $\"\"$ , $\"\"$ , and $\"\"$ .