Find the value using the definition of tangent.
Substitute the values into the definition.
Simplify the result.
Multiply the numerator by the reciprocal of the denominator.
Cancel the common factor of .
Move the leading negative in into the numerator.
Write as a fraction with denominator .
Factor out the greatest common factor .
Cancel the common factor.
Rewrite the expression.
Multiply and .
Divide by .
The result can be shown in multiple forms.