मराठी

If θ = 15° then (sin 3θ)/(cos 4θ) is equal to ______. - Mathematics

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प्रश्न

If θ = 15° then `(sin 3θ)/(cos 4θ)` is equal to ______.

पर्याय

  • `sqrt(2)`

  • 2

  • `sqrt(3)`

  • 3

MCQ
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उत्तर

If θ = 15° then `(sin 3θ)/(cos 4θ)` is equal to `underlinebb(sqrt(2))`.

Explanation:

3θ = 45°.

So, sin 3θ = sin 45°

= `sqrt(2)/2 . 4θ` 

= 60° 

So, cos 4θ = cos 60°

= `1/2` 

Therefore, `(sin 3θ)/(cos 4θ)`

= `(sqrt(2)/2)/(1/2)`

= `sqrt(2)`

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पाठ 18: Trigonometric Ratios of Some Standard Angles and Complementary Angles - Exercise 18D [पृष्ठ ३८१]

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नूतन Mathematics [English] Class 9 ICSE
पाठ 18 Trigonometric Ratios of Some Standard Angles and Complementary Angles
Exercise 18D | Q 7. | पृष्ठ ३८१
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