// calc sine of angle theta, expressed in radians double s = Math.sin( theta );You can leave off the Math. if you use a static import.
static import java.lang.Math.*; ... // calc sine of angle theta, expressed in radians double s = sin( theta );
For the most part, all the trig functions you need are in the java.lang. Math class with the same names mathematicians use namely: sin, cos, tan, asin, acos, atan, sinh, cosh, tanh.
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