## Inverse

### If not p, then not q.

The concept of inverse is used in many areas of mathematics such as algebra, trigonometry, and calculus.

In general, the inverse of an operation or function undoes the action or transformation of the original operation or function. For example, the inverse of addition is subtraction, and the inverse of multiplication is division.

In algebra, the inverse of a function is a new function that undoes the original function. In other words, if f(x) is a function, then its inverse, denoted as f^-1, is a function that takes the output of f(x) as its input and returns the input that produced that output. The notation f(f^-1(x)) = x and f^-1(f(x)) = x means that the original function and its inverse function cancel each other out.

In trigonometry, the inverse functions are used to find the angles of a right triangle given the side lengths. The inverse functions of sine, cosine, and tangent are denoted as arcsin, arccos, and arctan, respectively.

In calculus, the inverse function theorem states that if a function f is invertible, then its inverse is also differentiable, and the derivative of the inverse is equal to the reciprocal of the derivative of the original function at the corresponding point.

Overall, understanding the concept of inverse is crucial in solving problems related to functions, equations, and geometry.

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