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Function Details : acos

doubleacos(double x) ;

Return Type : double

Double-precision floating point (±1.7E±308, ~15 decimal digits)

Read about return values of acos function .

1st Parameter Type : double

Double-precision floating point (±1.7E±308, ~15 decimal digits)

1st Parameter

Value between -1 and 1 whose arc cosine is computed

Read more about parameters of acos in parameters section

The acosfunction in C language Calculates the arc cosine of the specified number.

The acos function, also known as the inverse cosine function, takes a number between -1 and 1 and returns the angle whose cosine is equal to that number. The result is given in radians, within the range from 0 to π (0 to 180 degrees). If the input is outside the valid range, the function cannot calculate an angle and instead returns NaN, indicating an invalid result.

The acosfunction takes 1 parameter:

•
double `x`: Value between -1 and 1 whose arc cosine is computed

The acos function return value :

Returns the arc cosine of the input value, in radians, in the range [0, π]
If the input is outside the range [-1, 1], it returns NaN

Output

This example demonstrates the basic usage of the `acos` function with different input values within the valid range.