acos()

Returns the inverse cosine of the argument in radians.

Syntax

acos(n)

Example 1

Use acos() to return the inverse cosine of 0.0:

#include <iostream>
#include <cmath>
int main() {
double x = 0.0;
double result;
result = std::acos(x);
std::cout << result << " radians" << "\n";
// Output: 1.5708 radians
}
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