prove that cos15 - sin15/cos15+sin15=1/root 3
cos 15 = cos (45 – 30) = cos 45 cos 30 + sin 45 sin 30
and sin 15 = sin (45 – 30) = sin 45 cos 30 – cos 45 sin 30
OR
prove that cos15 - sin15/cos15+sin15=1/root 3
cos 15 = cos (45 – 30) = cos 45 cos 30 + sin 45 sin 30
and sin 15 = sin (45 – 30) = sin 45 cos 30 – cos 45 sin 30
OR