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If cosA=3/4, then 32 sin (A/2) sin ((5...

If cosA=3/4, then 32 sin (A/2) sin ((5A) /2)= ------------- (A) √11 (B) -√11 (C) 11 (D) -11

A

7

B

8

C

11

D

none of these

Text Solution

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The correct Answer is:
C
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OBJECTIVE RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS AND IDENTITIES-Exercise
  1. if sin x + sin^2 x = 1, then the value of cos^2 x + cos^4x is

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  2. If tan(x/2)=cosec x-sin x, then find the value of tan^(2) (x/2).

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  3. If cosA=3/4, then 32 sin (A/2) sin ((5A) /2)= ------------- ...

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  4. Prove that: (1+cos. (pi)/8)(1+cos. (3pi)/8)(1+cos. (5pi)/8)(1+cos. (7...

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  5. If t a n^2theta=2t a n^2varphi+1 , prove that cos2theta+s in^2varphi=0...

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  6. If sin2theta=cos3thetaa n dtheta is an acute angle, then sintheta equa...

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  7. If f(x)=cos^2theta+sec^2theta, then f(x)<1 (b) f(x)=1 2>f(x)>1 (d)...

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  8. The value of sinpi/(14)sin(3pi)/(14)sin(5pi)/(14)sin(7pi)/(14)sin(9pi)...

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  9. The value of sin(pi/14)sin((3pi)/14)sin((5pi)/14) is

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  10. If sin(alpha+beta)=1\ a n dsin(alpha-beta)=1/2,\ w h e r e\ 0lt=,\ bet...

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  11. If cos(theta-alpha)=a and cos(theta-beta)=b then the value of sin^(2)(...

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  12. If K=sin(pi/(18))sin((5pi)/(18))sin((7pi)/(18)), then the numerical va...

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  13. Show that tan1^0tan2^0tan89^0=1

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  14. If 1+sinx+sin^2x+sin^3x+oo is equal to 4+2sqrt(3),0<x<pi, then x is eq...

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  15. If x cosalpha+y sinalpha=2a, x cos beta+y sinbeta=2aand 2sin""(alp...

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  16. If tan x =(2b)/ (a- c), y = acos^2 x + 2bsin x cos x + csin^2 x, z=as...

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  17. If alpha+beta+gamma=2pi, then show that tan.alpha/2 + tan.beta/2 + tan...

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  18. If sintheta-costhetalt0, then theta lies between

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  19. Within what limits must A/2 lies if 2sinA/2=-sqrt(1+sinA)-sqrt(1-sinA)...

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  20. If 2cos""(A)/(2)=sqrt(1+sinA)+sqrt(1-sinA), thenA/2 iles between,

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