# Precalculus Examples

,
Replace the variable with in the expression.
Rewrite in terms of sines and cosines.
Cancel the common factor of .
Write as a fraction with denominator .
Factor out the greatest common factor .
Cancel the common factor.
Rewrite the expression.
Simplify.
Multiply and to get .
Divide by to get .
is a full rotation so replace with .
The exact value of is .
The expression contains a division by . The expression is undefined.
Undefined