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If sin2theta=cos3thetaa n dtheta is an a...

If `sin2theta=cos3thetaa n dtheta` is an acute angle, then `sintheta` equal `(sqrt(5)-1)/4` (b) `-((sqrt(5)-1)/4)` `(sqrt(5)+1)/4` (d) `(-sqrt(5)-1)/4`

A

`(sqrt(5)-1)/(4)`

B

`(-sqrt(5)-1)/(4)`

C

0

D

none of these

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TARGET PUBLICATION-TRIGONOMETRIC FUNCTIONS -Competitive Thinking
  1. Solve (tan3x-tan2x)/(1+tan3xtan2x ')=1

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  2. (tan3theta-1)/(tan3theta+1)=sqrt(3), then the general value of theta i...

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

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  4. Find the gereral of the equation sinx-3sin2x+sin3x=cosx-3cos2x+cos3x.

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  5. If cot (alpha + beta) = 0, then sin (alpha + 2 beta) is equal to

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  6. tantheta+tan2theta=tanthetatan2theta=1

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  7. sec4theta - sec2theta=2

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  8. If sin 2x+sin4x=2sin3x then x=

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  9. The equation alpha sin x +b cos x =c where |c| gt sqrt(a^2+ b^2) has

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  10. If tan ((p pi)/4)=cot ((qpi)/4), then prove that p+q=2(2n+1), n in Z.

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  11. 2sin^(2)x + sin^(2)2x =2

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  12. If tan(cotx)=cot(tanx), then sin2x is equal to

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  13. Find the general solution of the equation (sqrt3-1) sin theta +(sqrt3 ...

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  14. The solution of the equation sectheta-cosectheta=(4)/(3) is

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  15. The general value of theta satisfying the equation tan^2theta+sec2thet...

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  16. The general value of theta in the equation 2sqrt(3)costheta=tantheta i...

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  17. The number of values of x in the interval [0,5pi] satisfying the equat...

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  18. Principal solutions of the equation sin 2x + cos 2x = 0, where pi < x ...

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  19. If 2sin^(2)theta=3costheta, where 0lethetale2pi, then find the value ...

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  20. If 5cos2theta+2"cos"^(2)(theta)/(2)+1=0, when (0ltthetaltpi), then t...

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