Lines Matching refs:qx
297 * For better accuracy when x > 0.3, let qx = |x|/4 with
298 * the last 32 bits mask off, and if x > 0.78125, let qx = 0.28125.
300 * cos(x+y) = (1-qx) - ((x*x/2-qx) - (r-x*y)).
301 * Note that 1-qx and (x*x/2-qx) is EXACT here, and the
315 double a, iz, z, r, qx;
328 qx = 0.28125;
330 INSERT_WORDS(qx, ix - 0x00200000, 0); /* x/4 */
332 iz = 0.5 * z - qx;
333 a = one - qx;