eina_matrix: replace cosf by cos to gain more accuracy

Summary:
cos function is much much more accurate than cosf.
this patch replaces cosf by cos to gain more accuracy.

Reviewers: cedric, jsuya, vtorri

Subscribers: vtorri, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D10695

src/lib/eina/eina_matrix.c

@@ -551,8 +551,8 @@ eina_matrix3_rotate(Eina_Matrix3 *m, double rad)
     *       Later we would want someone to look at this and improve accuracy.
     */
 #if 1
-   c = cosf(rad);
-   s = sinf(rad);
+   c = cos(rad);
+   s = sin(rad);
 #else
    /* normalize the angle between -pi,pi */
    rad = fmod(rad + M_PI, 2 * M_PI) - M_PI;

src/tests/eina/eina_test_matrix.c

@@ -463,8 +463,8 @@ EFL_START_TEST(eina_matrix3_operations)
    fail_if (!MATRIX3_CMP(m1.xx, m1.xy, m1.xz,
                          m1.yx, m1.yy, m1.yz,
                          m1.zx, m1.zy, m1.zz,
-                         cosf(rotate_radian), -sinf(rotate_radian), 0,
-                         sinf(rotate_radian),  cosf(rotate_radian), 0,
+                         cos(rotate_radian), -sin(rotate_radian), 0,
+                         sin(rotate_radian),  cos(rotate_radian), 0,
                          0, 0, 1));
 
    eina_matrix3_values_set(&m1,