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Sum of roots of the equation x^4-2x^2sin...

Sum of roots of the equation `x^4-2x^2sin^2(pix/2)+1=0` is `0` (b) 2 (c) 1 (d) 3

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CENGAGE ENGLISH-TRIGONOMETRIC FUNCTIONS-All Questions
  1. One of the general solutions of sqrt(3) cos theta-3 sin theta=4 sin 2 ...

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  2. Let theta in ( 0, pi/4) and t1 = (tan theta)^(tan theta),t2 = (tan th...

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  3. Sum of roots of the equation x^4-2x^2sin^2(pix/2)+1=0 is 0 (b) 2 ...

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  4. Let n be a positive integer such that sinpi/(2n)+cospi/(2n)=(sqrt(n))...

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  5. Let O be the circumcenter, H be the orthocentre, I be the incenter, an...

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  6. If s e c^2theta=(4x y)/((x+y)^2) is true if and only if (a)x+y!=0 (b)...

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  7. Prove that in a A B C ,sin^2A+sin^2B+sin^2C<=9/4dot

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  8. The number of solution of the pair of equations 2sin^2theta-cos2theta=...

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  9. The rational number which equals the number 2. 357 with recurring de...

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  10. If (cos^4A)/(cos^2B)+(sin^4A)/(sin^2B)=1 then prove that (cos^4B)/(cos...

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  11. Prove that r1+r2+r3-r=4R

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  12. Number of solution of equation 2sinx/2cos^2x-2sinx/2sin^2x=cos^2x-sin^...

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  13. If cot(theta-alpha),3cottheta,"cot"(theta+alpha) are in A.P. and theta...

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  14. If x=sectheta-tanthetaa n dy=cos e ctheta+cottheta, then prove that x...

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  15. If A >0,B >0a n dA+B=pi/3, the maximum value of tanAtanB is

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  16. Prove that cosA+cosB+cosC=1+r/R

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  17. denote the positive solution of the equation 3+3costheta=2sin^2thetado...

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  18. If (sec^4theta)/a+(tan^4theta)/b=1/(a+b), then prove that |b|lt=|a| .

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  19. Prove that: ((cosA+cos B)/(sinA-sinB))^n+((sinA+sinB)/(cosA-cosB))^n={...

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  20. Prove that ("a c o s"A+b cosB+c cosC)/(a+b+c)=r/Rdot

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