Multiple Choice Questions on What is the value of cos 70 deg cos 40 deg sin 70 deg sin 40 deg ........ for Mathematics - All Exams Preparation

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Multiple Choice Questions

What is the value of cos 70 deg cos 40 deg sin 70 deg sin 40 deg ........

Quantitative Aptitude ( CCS) Trignometry
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    What is the value of cos 70° cos 40° + sin 70° sin 40°?

    1 /√2

    Incorrect Answer

    √2

    Incorrect Answer

    √3 /2

    Correct Answer

    √3

    Incorrect Answer
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    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)]

    By: Amit Kumar
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