Interchange the variables.

Rewrite the equation as .

Take the inverse cosine of both sides of the equation to extract from inside the cosine.

Multiply both sides of the equation by .

Simplify both sides of the equation.

Cancel the common factor of .

Cancel the common factor.

Rewrite the expression.

Multiply by .

Multiply both sides of the equation by .

Simplify both sides of the equation.

Cancel the common factor of .

Cancel the common factor.

Rewrite the expression.

Multiply by .

Replace the with to show the final answer.

Set up the composite result function.

Evaluate by substituting in the value of into .

Since , is the inverse of .

Find the Inverse cos(x/2)