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# Trigonometry Examples

Subtract from .

The resulting angle of is positive, less than , and coterminal with .

Since the angle is in the third 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 .