Rework twin_tan with twin_sincos

Author: ndsl7109256

src/trig.c

@@ -26,8 +26,8 @@ twin_fixed_t twin_cos(twin_angle_t a)
 
 twin_fixed_t twin_tan(twin_angle_t a)
 {
-    twin_fixed_t s = twin_sin(a);
-    twin_fixed_t c = twin_cos(a);
+    twin_fixed_t s, c;
+    twin_sincos(a, &s, &c);
 
     if (c == 0) {
         if (s > 0)
@@ -73,7 +73,7 @@ void twin_sincos(twin_angle_t a, twin_fixed_t *sin, twin_fixed_t *cos)
     /* limit to [0..360) */
     a = a & (TWIN_ANGLE_360 - 1);
     int c = a > TWIN_ANGLE_90 && a < TWIN_ANGLE_270;
-    /* special case for 90 degrees - no room in table */
+    /* special case for 90 degrees */
     if ((a & ~(TWIN_ANGLE_180)) == TWIN_ANGLE_90) {
         sin_val = TWIN_FIXED_ONE;
         cos_val = 0;