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Find the sum of the series cos e ctheta+...

Find the sum of the series `cos e ctheta+cos e c2theta+cos e c4theta+ tont e r m sdot`

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CENGAGE ENGLISH-TRIGONOMETRIC FUNCTIONS-All Questions
  1. In A B C , if sin^3theta=sin(A-theta)sin(B-theta)sin(C-theta) , then ...

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  2. If sin^(-1)a+sin^(-1)b+sin^(-1)c=pi, then the value of asqrt((1-a^2))+...

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  3. Find the sum of the series cos e ctheta+cos e c2theta+cos e c4theta+ t...

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  4. If tan6theta=p/q , find the value of 1/2(pcosec2theta-qsec2theta)

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  5. If 0ltalphaltpi/2 and sinalpha+cosalpha+tanalpha+cotalpha+secalpha+cos...

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  6. Prove that 1+cot theta <= cot (theta/2) for 0 &lt; theta &lt; pi. Find...

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  7. Let A,B,C, be three angles such that A=pi/4 and tanB tanC=pdot Find ...

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  8. Eliminate x from equations sin(a+x)=2b and sin(a-x)=2c.

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  9. If t a nbeta=(nsinalphacosalpha)/(1-nsin^2alpha) , show that tan(alph...

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  10. Prove that: (sinx)/(cos3x)+(sin3x)/(cos9x)+(sin9x)/(cos27 x)=(1/2)(ta...

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  11. If theta=3alphaand sintheta=a/(sqrt(a^2+b^2)), the value of the expre...

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  12. The value of tan6^0tan42^0tan66^0tan78^0 is (a)1 (b) 1/2 (c) 1/...

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  13. In triangle A B C , if angle is 90^0 and the area of triangle is 30 sq...

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  14. If sqrt(2)cos A=cos B+cos^3B ,a n dsqrt(2)sinA=sinB-sin^3Bt h e nsin(A...

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  15. In a right angled triangle the hypotenuse is 2sqrt(2) times the perpe...

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  16. A circular ring of radius 3cm hangs horizontally from a point 4 cm ve...

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  17. If tanbeta=2sinalphasingammacos e c(alpha+gamma), then cotalpha,cotbe...

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  18. tan9-tan27-tan63+tan81=4

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  19. Let x=sin1^0, then the value of the expression. 1/(cos0^0dotcos1^0)+...

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  20. If (tan3A)/(tanA)=k(k!=1) then which of the following is not true? (...

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