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The equation cos^8x+bcos^4x+1=0 will hav...

The equation `cos^8x+bcos^4x+1=0` will have a solution if `b` belongs to

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CENGAGE PUBLICATION-TRIGONOMETRIC FUNCTIONS-All Questions
  1. If alpha+beta =(pi/2) and beta+gamma=alpha, then the tanalpha equals:

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  2. prove that a^2sin2B+b^2sin2A=4Delta

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  3. The equation cos^8x+bcos^4x+1=0 will have a solution if b belongs to

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  4. Let f(n)=2cosn xAAn in N , then f(1)f(n+1)-f(n) is equal to

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  5. If in triangle A B C, \delta = a^2-(b-c)^2 , then find the value of ta...

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  6. The number of solutions of [sinx+cosx]=3+[-sinx]+[-cosx](w h e r e[] d...

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  7. If sintheta1-sintheta2=a a n d costheta1+costheta2=b , then (a)a^2+b...

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  8. If a , ba n dc are the side of a triangle, then the minimum value of (...

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  9. sinx+cosx=y^2-y+a has no value of x for any value of y if a belongs to...

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  10. If (cosx)/a=(cos(x+theta))/b=(cos(x+2theta))/c=(cos(x+3theta))/d then ...

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  11. Let PQR be a triangle of area Delta with a=2,b=7/2 and c=5/2, where a,...

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  12. If the inequality sin^2x+acosx+a^2>1+cosx holds for any x in R , then...

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  13. If cosalpha+cosbeta=0=sinalpha+sinbeta, then cos2alpha+cos2beta is e...

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  14. If the angle A ,Ba n dC of a triangle are in an arithmetic propression...

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  15. The equation sin^4x-2cos^2x+a^2=0 can be solved if

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  16. Value of (3+cot80^0cot20^0)/(cot80^0+cot20^0) is equal to (a)cot20^0...

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  17. Let A B C be a triangle such that /A C B=pi/6 and let a , b and c deno...

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  18. If tanalpha is equal to the integral solution of the inequality 4x^2-...

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  19. Consider the system of linear equations in x , ya n dz : ""(sin3theta...

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  20. Let A B C D be a quadrilateral with area 18 , side A B parallel to the...

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