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If 0 le x le 2pi, then the number of rea...

If `0 le x le 2pi`, then the number of real values of x, which satisfy the equation `cos x + cos 2x + cos 3x + cos 4x=0`, is

A

`5`

B

`7`

C

`9`

D

`3`

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The correct Answer is:
B
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RESONANCE ENGLISH-FUNDAMENTAL OF MATHEMATICS-Exercise
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  4. Let A and B be two sets containing 2 elements and 4 elements, respecti...

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  8. Let A and B be two sets containing 2 elements and 4 elements, respecti...

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  9. If the anlges of elevation of the top of a tower from three collinear ...

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  10. If 0 le x le 2pi, then the number of real values of x, which satisfy t...

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  11. If 5 (tan ^(2) x - cos ^(2) x ) = 2 cos 2x +9, then the value of cos 4...

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  12. Let a vertical tower A B have its end A on the level ground. Let C be ...

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  13. Let S= {x in R : x ge 0 and 2 |sqrt(x) - 3| + sqrt(x)(sqrt(x) - 6) +...

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  14. If the sum of all the solutions of the equation 8 cosx.(cos(pi/6+x)cos...

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  15. PQR is a triangular park with PQ=PR=200m. A.T.V. tower stands at the m...

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  16. Let S= {x in R : x ge 0 and 2 |sqrt(x) - 3| + sqrt(x)(sqrt(x) - 6) +...

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  17. In a class of 140 students numbered 1 to 140, all even numbered studen...

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  18. The sum of all values of theta in (0,pi/2) satisfying sin^(2)2theta+co...

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  19. the value of cos((pi)/(2^2))cos((pi)/(2^3))cos((pi)/(2^4)) .....cos((...

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  20. If sin^(4) alpha + 4 cos^(4) beta + 2 = 4sqrt(2) sin alpha cos beta, a...

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