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cos1^@xxcos2^@xxcos3^@xx...xxcos180^@=?...

`cos1^@xxcos2^@xxcos3^@xx...xxcos180^@=?`

A

`-1`

B

`1`

C

`0`

D

`(1)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
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RS AGGARWAL-TRIGONOMETRIC IDENTITIES-Multiple Choice Questions (Mcq)
  1. Choose the correct answer in each of the following questions: tan 1...

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  2. Evaluate each of the following: cot 12^@cot 38^@cot52^@cot60^@cot78^@ ...

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  3. cos1^@xxcos2^@xxcos3^@xx...xxcos180^@=?

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  4. Evaluate : (2sin^2 63^@+1+2sin^2 27^@)/(3 cos ^2 17^@-2+3cos^2 73^@)

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  5. Choose the correct answer in each of the following questions: sin47^...

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  6. sec70^(@)sin20^(@)+cos20^(@)"cosec"70^(@)=?

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  7. If sin 3A =cos(A-10^(@)) where 3A is an acute angle , then find the va...

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  8. If sec 4A="cosec"(A-10^(@))and 4A" is acute then " angle A=?

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  9. Choose the correct answer in each of the following questions: If A a...

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  10. Choose the correct answer in each of the following questions: If c...

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  11. Choose the correct answer in each of the following questions: sin(45...

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  12. Choose the correct answer in each of the following questions: sec^(2...

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  13. Choose the correct answer in each of the following questions: "cosec...

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  14. Choose the correct answer in each of the following questions: (2tan^...

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  15. Find the value of [(sin^2 2 2^(@)+sin^2 6 8^(@))/(cos^2 2 2^(@)+cos^2 ...

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  16. Without using trigonometric tables , evaluate the following : (co...

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  17. Choose the correct answer in each of the following questions: (cos38...

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  18. If 2sin 2 theta =sqrt(3) " then " theta=?

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  19. Choose the correct answer in each of the following questions: If 2co...

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  20. Choose the correct answer in each of the following questions: If sqr...

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