$\"\"$

The trigonometric equation is $\"\"$ .

Rewrite the trigonometric equation as $\"\"$

The trigonometric function : $\"\"$ .

The length of hypotenuse is $\"\"$ .

The length of opposite side is $\"\"$ .

Find the length of adjacent side.

Pythagorean Theorm : $\"\"$ .

$\"\"$

The length of adjacent side is $\"\"$ .

If the ratio of the sides are $\"\"$ then the ratio of angles are $\"\"$ .

$\"\"$

Observe the diagram.

$\"\"$

The acute angle $\"\"$ is $\"\"$ .

$\"\"$

The acute angle $\"\"$ is $\"\"$ .