The value of cos 2° cos 4° cos 6

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Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Trigonometry

Question:

The value of cos 2° cos 4° cos 6° cos 8° cos 88° cos 86° cos 84° cos 82° cos 90° is?

Options:

cos 10°

Correct Answer:

Explanation:

cos 2° cos 4° cos 6° cos 8° cos 88° cos 86° cos 84° cos 82° cos 90°

= ( cos 2° cos 88° ) ( cos 4° cos 86° ) (cos 6° cos 84° ) ( cos 8° cos 82°) cos 90°

= 0 ( because cos 90° = 0 )