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Prove that: t a nalpha+2tan2alpha+4tan4a...

Prove that: `t a nalpha+2tan2alpha+4tan4alpha+8cot8alpha=cotalpha`

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CENGAGE ENGLISH-TRIGONOMETRIC FUNCTIONS-All Questions
  1. If sinx+cosx=sqrt(y+1/y) for x in [0,pi] , then (a) x=pi/4 (b) y=0 (...

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  2. Which of the following pieces of data does NOT uniquely determine an ...

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  3. Prove that: t a nalpha+2tan2alpha+4tan4alpha+8cot8alpha=cotalpha

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  4. sintheta+sqrt(3)costheta=6x-x^2-11 ,0lt=thetalt=4pi,x in R , (a) hold...

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  5. If the angles of a triangle are in the ratio 4:1:1, then the ratio of ...

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  6. Find all the solution of 4cos^2xsinx-2sin^2x=3sinx

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  7. If f(theta)=(1-sin2theta+cos2theta)/(2cos2theta) , then value of 8f(1...

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  8. In triangle A B C ,2a csin(1/2(A-B+C)) is equal to (a) a^2+b^2-c^2 (b...

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  9. tan100^0+tan125^0+tan100^0tan125^0 is equal to 0 (b) 1/2 (c) -1 (d) ...

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  10. The solution set of the system of equations x+y=(2pi)/3,cosx+cosy=3/2,...

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  11. Let A1,A2,....An be the vertices of an n-sided regular polygon such t...

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  12. The positive integer value of n >3 satisfying the equation 1/(sin(pi/n...

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  13. Let f(x)=x^2a n dg(x)=sinxfora l lx in Rdot Then the set of all x sat...

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  14. IF the lengths of the side of triangle are 3,5 and 7, then the largest...

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  15. For x in (0, pi) the equation sin x+2 sin 2x-sin 3x=3 has

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  16. In triangle A B C ,/B=pi/3,a n d/C=pi/4dot Let D divided B C internall...

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  17. If costheta1 =2costheta2, then tan((theta1-theta2)/2)tan((theta1+thet...

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  18. If (cos e c^2theta-4)x^2+(cottheta+sqrt(3))x+cos^2(3pi)/2=0 holds true...

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  19. Consider the following statements concerning a DeltaABC (i) The sid...

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  20. Which of the following is the value of sin 27^0-cos 27^0? (a) -(s...

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