👉 The arcsin is a mathematical function in trigonometry that represents the inverse sine of a given angle. It is defined as: \[ \arcsin(x) = \frac{\pi}{2} - \frac{x}{\sqrt{1-x^2}} \] where x is a real number. This function is often used to find the angle whose sine is a given value, such as in trigonometric functions like sin(x), cos(x), or tan(x).