Trignometry

Quantitative Aptitude (CCS)

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What is the value of cos 70° cos 40° + sin 70° sin 40°?

1 /√2

√2

√3 /2

√3

Explanation:

cos 70° cos 40° + sin 70° sin 40° = cos(70° – 40°)
= cos 30° = √3 /2
[because cos x cos y – sin x sin y = cos (x – y)]

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