# Trigonometry Examples

Use the definition of cosine to find the known sides of the unit circle right triangle. The quadrant determines the sign on each of the values.

Find the opposite side of the unit circle triangle. Since the adjacent side and hypotenuse are known, use the Pythagorean theorem to find the remaining side.

Replace the known values in the equation.

Simplify the expression.

Remove parentheses around .

Opposite

Raise to the power of .

Opposite

Remove parentheses around .

Opposite

Opposite

Rewrite as .

Opposite

Simplify the expression.

Multiply by .

Opposite

Subtract from .

Opposite

Any root of is .

Opposite

Opposite

Opposite

Use the definition of sine to find the value of .

Substitute in the known values.

Use the definition of tangent to find the value of .

Substitute in the known values.

Simplify the value of .

Multiply by .

Simplify.

Combine.

Raise to the power of .

Raise to the power of .

Use the power rule to combine exponents.

Add and .

Rewrite as .

Multiply by .

Use the definition of cotangent to find the value of .

Substitute in the known values.

Divide by .

Use the definition of secant to find the value of .

Substitute in the known values.

Simplify the value of .

Multiply by .

Simplify.

Combine.

Raise to the power of .

Raise to the power of .

Use the power rule to combine exponents.

Add and .

Rewrite as .

Use the definition of cosecant to find the value of .

Substitute in the known values.

Divide by .

This is the solution to each trig value.