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If r/(r1)=(r2)/(r3), then (a) A=90^0 (b...

If `r/(r_1)=(r_2)/(r_3),` then (a) `A=90^0` (b) `B=90^0` (c) `C=90^0` (d) none of these

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CENGAGE ENGLISH-TRIGONOMETRIC FUNCTIONS-All Questions
  1. sum(n=1)^ootan(theta/(2^n))/(2^(n-1)cos(theta/(2^(n-1)))) is

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  2. A parallelogram containing a 60^0 angle has perimeter p and its longer...

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  3. If r/(r1)=(r2)/(r3), then (a) A=90^0 (b) B=90^0 (c) C=90^0 (d) none ...

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  4. If sin(sinx+cosx)=cos(cosx-sinx), and largest possible value of sinx ...

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  5. If 0lt=xlt=pi/3 then range of f(x)=sec(pi/6-x)+sec(pi/6+x) is

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  6. For each natural number nlt=2, prove that sinx1cosx2+sinx2c0sx+3++sinx...

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  7. The values of x1 between 0 and 2pi , satisfying the equation cos3x+c...

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  8. If y=(sin^4x-cos^4x+sin^2xcos^2x)/(sin^4x+cos^4x+sin^2xcos^2x),x in (0...

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  9. In an acute angled triangle A B C ,r+r1=r2+r3a n d/B >pi/3, then (a) b...

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  10. If un=sin^("n")theta+cos^ntheta, then prove that (u5-u7)/(u3-u5)=(u3)/...

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  11. If x ,y in R and x^2+y^2+x y=1, then find the minimum value of x^3y+x...

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  12. The general solution of the equation sin^(100)x-cos^(100)x=1 is (a)2np...

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  13. If in triangle A B C ,sumsin(A/2)=6/5a n dsumI I1=9 (where I1,I2 a n d...

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  14. Prove that in A B C ,tanA+tanB+tanCgeq3sqrt(3,) where A , B , C are...

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  15. In triangle A B C ,/A=60^0,/B=40^0,a n d/C=80^0dot If P is the center ...

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  16. If cos3x+sin(2x-(7pi)/6)=-2 , then show that x is of the form π / 3(6...

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  17. Prove that sin2A + sin2B + sin2C = 4sinA · sinB · sin C

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  18. If H is the othrocenter of an acute angled triangle ABC whose circumci...

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  19. The number of solutions of the equation 1+cosx+cos2x+sinx+sin2x+sin3x=...

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  20. Let us consider the equation cos^4x/a+sin^4x/b=1/(a+b),x in[0,pi/2],a,...

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