7. Find the value of cos 15°
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The exact value to cos 15° is √(2+√(3))/2
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Answer:
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
final solution is √3+1/2√2
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