prove that cos(15°)
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cos 15°
= cos (45 - 30)
It is of the form cos (A - B)
cos (A - B) = cos A cos B + sin A sin B
cos 45° cos 30° + sin 45° sin 30°
(1/√2)(√3/2) + (1/√2)(1/2)
√3/2√2 + 1/2√2
(√3 + 1)/2√2
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