Answers

2015-06-16T16:24:06+05:30
Sin(15)
= sin(45-30)
= sin 45 cos 30 - cos 45 sin 30
= 1/√2 × √3/2 - 1/√2 × 1/2
= √3/2√2 - 1/2√2
= (√3-1)/2√2

cos(15)
= cos(45-30)
= 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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