sin cos tan

(sin radians) (cos radians) (tan radians)

The three basic trigonometric functions, each taking an angle in radians and returning a float. sin is the sine, cos the cosine, and tan the tangent. Every backend computes them with fdlibm (StrictMath on the interpreter and the JVM, the same algorithm on WASM), its exact argument reduction for large arguments included, so the digits agree everywhere: (sin 1e22) is -0.8522008497671888. The zero and quadrant anchors are exact everywhere: (sin 0) is 0.0, (cos 0) is 1.0, (sin (/ pi 2)) is 1.0, (cos pi) is -1.0. NaN and infinite arguments give NaN on every backend.