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tanalpha=1/7,tanbeta=1/3,t h e ncos2alph...

`tanalpha=1/7,tanbeta=1/3,t h e ncos2alpha=`

A

`sin 2 beta `

B

`sin 4 beta `

C

`sin 3 beta`

D

`sin beta `

Text Solution

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The correct Answer is:
B
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TARGET PUBLICATION-TRIGONOMETRIC FUNCTIONS OF COMPOUND ANGLES -CRITICAL THINKING
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  4. If costheta=1/2(x+1/x) then 1/2(x^2+1/x^2)=

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  5. If sin x+ cos x =1/5 and 0 le x le pi, then tan x is equal to

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  7. If : tan((pi)/(4)+theta) - tan((pi)/(4) - theta) =m*tan (ntheta),"then...

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  8. If sec 2 theta =p + tan 2 theta, then the value of sin^(2) theta in ...

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  9. If theta and phi are angles in first quadrant and tantheta=1/7 and sin...

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  11. If tan^2theta=2tan^2varphi+1,t h e ncos2theta+sin^2varphi equals -1 (...

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  12. If tantheta-cottheta=aandsintheta+costheta=b(b^2-1)^2(a^2+4) is equal...

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  13. If sin A sin 2A = x and cos A + cos 2A = y, then (x^(2)+y^(2)) (x^(2)+...

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  14. If tan x= (2b)/(a-c), a!=c, y = a cos^2 x +2b sin x*cos x + c sin^2x, ...

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  15. 8*sin(x/8)*cos(x/2)*cos(x/4)*cos(x/8)=

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  16. If x= cos 10^(@)cos 20^(@) cos 40^(@), then the value of x is

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  17. If theta =(pi)/(2 ^(n) +1), then cos theta cos 2 theta cos 2^(2) the...

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  18. cos(pi/7)cos((2pi)/7)cos((4pi)/7)=

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  20. The value of (1)/(sin 10^(@)) -(sqrt3)/(cos 10^(@)) is equal to

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