Multiple Choice Questions on What is the value of sin 79 deg cos 19 deg ndash cos 79 deg sin 19 deg ........ for Mathematics - All Exams Preparation

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Multiple Choice Questions

What is the value of sin 79 deg cos 19 deg ndash cos 79 deg sin 19 deg ........

Quantitative Aptitude ( CCS) Trignometry
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    What is the value of sin 79° cos 19° – cos 79° sin 19°.

    √3 /2

    Correct Answer

    1 /√2

    Incorrect Answer

    √2

    Incorrect Answer

    √3

    Incorrect Answer
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    Explanation:

    sin 79° cos 19° – cos 79° sin 19°
    By the formula,
    sin(x – y) = sin(x) cos(y) – cos(x) sin(y)
    = sin (79° - 19°) = sin 60°.
    = √3 /2

    By: Amit Kumar
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