Add to .

The resulting angle of is coterminal with but isn’t positive. Repeat the step.

Add to .

The resulting angle of is coterminal with but isn’t positive. Repeat the step.

Add to .

The resulting angle of is positive and coterminal with .

Since the angle is in the fourth quadrant, subtract from .

To write as a fraction with a common denominator, multiply by .

Combine fractions.

Combine and .

Combine the numerators over the common denominator.

Simplify the numerator.

Multiply by .

Subtract from .

Find the Reference Angle -(13pi)/3