The function \"\"\"f(x)=\\sqrt{4-\\left.

\"y=\\sqrt{4-\\left

Interchange the variables x and y.

\"x=\\sqrt{4-\\left

This equation defines \"f^{-1}\" implicitily.

Find explicit form of the inverse.

solve \"x=\\sqrt{4-\\left.

\"x^{2}={4-\\left.

\"y^{2}={4-\\left

\"y=\\sqrt{4-\\left.

The explicit form of the inverse is \"f^{-1}\\left.