Trignometry

Quantitative Aptitude ( CCS)

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What is the value of sin 79° cos 19° – cos 79° sin 19°.

√3 /2

1 /√2

√2

√3

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

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