Arduino - 三角函数

您实际上需要使用三角学，例如计算移动物体的距离或角速度。Arduino 提供了传统的三角函数（sin、cos、tan、asin、acos、atan），可以通过编写原型来概括这些函数。Math.h 包含三角函数的原型。

三角函数精确语法

double sin(double x); //returns sine of x radians
double cos(double y); //returns cosine of y radians
double tan(double x); //returns the tangent of x radians
double acos(double x); //returns A, the angle corresponding to cos (A) = x
double asin(double x); //returns A, the angle corresponding to sin (A) = x
double atan(double x); //returns A, the angle corresponding to tan (A) = x

例子

double sine = sin(2); // approximately 0.90929737091
double cosine = cos(2); // approximately -0.41614685058
double tangent = tan(2); // approximately -2.18503975868