If sin a minus b is equal to sin a into cos b minus cos a into sin b sin sin 15 degrees
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sin(A-B) = sin A cos B - cos A sin B
sin 15° =
sin (45 -30) = sin 45° cos 30° - cos 45° sin 30°
= 1/√2 × √3/2 - 1/√2 × 1/2
= √3 -1 / 2√2
sin 15° =
sin (45 -30) = sin 45° cos 30° - cos 45° sin 30°
= 1/√2 × √3/2 - 1/√2 × 1/2
= √3 -1 / 2√2
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