The value of cos 3° cos 5°

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Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Trigonometry

Question:

The value of cos 3° cos 5° cos 7° cos 9° cos 87° cos 85° cos 83° cos 81° cos 90° is ?

Options:

-1

Correct Answer:

Explanation:

cos 3° cos 5° cos 7° cos 9° cos 83° cos 85° cos 83° cos 81° cos 90°

= ( cos 3° cos 87° ) ( cos 5° cos 85° ) (cos 7° cos 83° ) ( cos 9° cos 81°) cos 90°

= 0 ( because cos 90° = 0 )