test/mjsunit/sin-cos.js

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// Test Math.sin and Math.cos.

function sinTest() {
  assertEquals(0, Math.sin(0));
  assertEquals(1, Math.sin(Math.PI / 2));
}

function cosTest() {
  assertEquals(1, Math.cos(0));
  assertEquals(-1, Math.cos(Math.PI));
}

sinTest();
cosTest();

// By accident, the slow case for sine and cosine were both sine at
// some point.  This is a regression test for that issue.
var x = Math.pow(2, 70);
assertTrue(Math.sin(x) != Math.cos(x));

// Ensure that sine and log are not the same.
x = 0.5;
assertTrue(Math.sin(x) != Math.log(x));