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The number of solutions of sum(r=1)^6 c...

The number of solutions of `sum_(r=1)^6 cos(rx)=6` in

A

Zero

B

1

C

6

D

12

Text Solution

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The correct Answer is:
B
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AAKASH INSTITUTE ENGLISH-TRIGNOMETRIC FUNCTIONS -Section-B (Objective Type Questions One option is correct)
  1. If sinx+cosx=sqrt(y+1/y), y gt 0, x in[0,pi], then find the least valu...

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  2. Find the number of solution(s) of the equation cos (pi sqrt(x)) cos ...

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  3. The number of solutions of sum(r=1)^6 cos(rx)=6 in

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  4. The number of values of x for which sin2x + cos4x = 2 is

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  5. If the equation cosx + 3cos(2Kx) = 4 has exactly one solution, then

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  6. The solution of the inequality log(1//2) sinx gt log(1//2) cosx is

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  7. The values of k for which the equation sin^4 x+cos^4 x+sin2x+k=0 posse...

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  8. If 4 sin^(4) x+ cos^(4) x=1, then x is equal to (n in Z)

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  9. Find all values of theta lying between 0 and 2 pi , satisying the e...

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  10. The arithmetic mean of the roots of the equation 4cos^3x-4cos^2x-cos(3...

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  11. The equation 2sin^(2)x=8-k(2-sinx) possesses a solution if

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  12. The number of roots of the equation x +2"tan"x = (pi)/(2) in the inter...

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  13. How many solutions does the equation sec x-1 =(sqrt2-1)tanx have in t...

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  14. The solution of equation (sin3x)/(2cos2x+1)=1/2 is

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  15. Determine the smallest positive value of x ( in degrees ) for which ...

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  16. If acosA=bcosB, then either the triangle is isosceles or right angled.

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  17. In DeltaABC if (sinA)/(sinC)=(sin(A-B))/(sin(B-C)), then a^(2), b^(2)...

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  18. If (cos A)/(a) = (cos B)/(b) = (cos C)/(c) and the side a = 2, then fi...

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  19. If cot(A/2) = (b+c)/a, then triangleABC, is

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  20. In triangle ABC, If tan((A-B)/2)=3/11 and a/b=7/4 then the value of an...

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