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Show that sqrt(3)\ cos e c\ 20^0-sec20^0...

Show that `sqrt(3)\ cos e c\ 20^0-sec20^0=4.`

A

2

B

1

C

4

D

`-4`

Text Solution

Verified by Experts

The correct Answer is:
C
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OBJECTIVE RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS AND IDENTITIES-Exercise
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  2. The vlaue of sqrt3cot20^(@)-4cos20^(@), is

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  3. Show that sqrt(3)\ cos e c\ 20^0-sec20^0=4.

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  4. The equation sin^2theta=(x^2+y^2)/(2x y),x , y!=0 is possible if

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  5. The value of sin(pi+theta)sin(pi-theta)cosec^(2)theta is equal to

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  6. If (sin(x+y))/(sin(x-y))=(a+b)/(a-b) , show that (tanx)/(tany)=a/b .

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  7. if sin x + sin^2 x = 1, then the value of cos^2 x + cos^4x is

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

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

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

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

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

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

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

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

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

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

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

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

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  20. 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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