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

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

Combine.

Combine.

Reorder the factors of .

Combine the numerators over the common denominator.

Multiply by .

Multiply by .

Add and .

Subtract from .

Add and .

Simplify 1/(1-cos(x))+1/(1+cos(x))