$\"\"$

Definition of Sine function : $\"\"$ , where $\"\"$ is the acute angle of the right angled triangle.

Definition of Cosine function : $\"\"$ .

Definition of Tangent function : $\"\"$ .

Rewrite the equation.

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$\"\"$ .

Definition of Cotangent function : $\"\"$ .

Rewrite the equation.

$\"\"$

$\"\"$ .

$\"\"$

$\"\"$ .