Arduino - 三角函数( Trigonometric Functions)
您需要使用三角函数，就像计算移动物体的距离或角速度一样。 Arduino提供传统的三角函数（sin，cos，tan，asin，acos，atan），可以通过编写原型进行总结。 Math.h包含三角函数的原型。
三角精确语法
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 (Example)
double sine = sin(2); // approximately 0.90929737091
double cosine = cos(2); // approximately -0.41614685058
double tangent = tan(2); // approximately -2.18503975868
