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If for two sets A and B,A-B=A then which...

If for two sets A and B,A-B=A then which of the following is true?

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PATHFINDER-TRIGONOMETRIC RATIOS AND IDENTITIES-QUESTION BANK
  1. if f(theta)=acostheta+bsintheta then -sqrt(a^2+b^2)lef(theta)lesqrt(a^...

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  2. Find the range of A/2 if it satisfies 2 cos( A/2)=sqrt(1+sin A)-sqrt(1...

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  3. If for two sets A and B,A-B=A then which of the following is true?

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  4. Match List - I with List-II

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  5. Match List - I with List-II

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  6. Five cards are drawn successively with replacement from a well-shuffle...

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  7. If sin 47^@+sin61^@-sin11^@-sin25^@ equals cosk^@,then k=?

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  8. The value of e^(log10tan1^@+log10tan2^@+log10tan3^@+...+log10tan89^@ i...

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  9. cos((2pi)/7)+cos((4pi)/7)+cos((6pi)/7)

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  10. The values of a for which the equation sqrtasinx-2cosx=sqrt2+sqrt(2-a...

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  11. If un=cos^ntheta+sin^ntheta then 2u6-ku4+1=0 then the numerical quanti...

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  12. In a Delta ABC

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  13. If the circumcentre of DeltaABC lies on incircle then cosA+cosB+cosC=s...

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  14. For all theta in [0,pi/2] show that cos(sintheta)gtsin(costheta)

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  15. Show that the value of the function (sinxcos3x)/(cosxsin3x), where eve...

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  16. if alpha+beta+gamma=2pi prove that cos^2alpha+cos^2beta+cos^2gamma-2co...

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  17. If cosalpha+cosbeta=1/3 and sinalpha+sinbeta=1/4 prove that cos(alpha-...

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  18. Find the value of t, where t in [-pi/2,pi/2] so that 2sint=(5x^2-2x+1...

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  19. If exp{(sin^2 x+sin^4 x+sin^6 x+...)In2} satisfies the quadratic equat...

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  20. If A+B+C=180^@ prove that: sin(B+2C)+sin(C+2A)+sin(A+2B)= 4 sin((B-C)/...

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