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If cot^(-1)x + cot^(-1)y + cot^(-1)z = p...

If `cot^(-1)x + cot^(-1)y + cot^(-1)z = pi`, prove that `xy + yz + zx = 1`.

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A DAS GUPTA-Inverse Circular Functions -Exercise
  1. If sin^(-1)x + sin^(-1)y = pi/2 prove that 2(x^(2) -x^(2)y^(2) + y^(2...

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  2. If tan^(-1)x+ tan^(-1)y + tan^(-1)z = pi, prove that x + y + z = xyz.

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  3. If cot^(-1)x + cot^(-1)y + cot^(-1)z = pi, prove that xy + yz + zx = ...

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  4. If sin^(-1)x + sin^(-1)y + sin^(-1)z =pi, prove that xsqrt(1 - x^(2))...

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  5. If in triangle ABC, C = 90^circ then prove that tan^(-1) (a/(c+b)) + ...

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  6. If in a triangle, two angles are tan^(-1)2 and tan^(-1)3 then prove t...

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  7. Solve tan^(-1)2x + tan^(-1)3x = pi/4

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  8. Solve: sin^(-1)x + sin^(-1)2x = pi/3.

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  9. Solve: cos^(-1) ((x^(2)-1)/(x^(2)+1))+ tan^(-1) ((2x)/(x^(2)-1)) = (2p...

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  10. Solve: sin^(-1)6x + sin^(-1)6 sqrt3x =-pi/2.

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  11. Solve tan^(-1)2x + tan^(-1)3x = pi/4

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  12. The principal value of cos^(-1) (cos 7pi/6)= .

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  13. The principal value of tan^(-1)(-sqrt3) = .

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  14. find the value of sin(sin^(-1)a+cos^(-1)a)

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  15. The numerical value of 2tan^(-1) (1/3) +tan^(-1) (1/7)=.

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  16. sin^(-1) (sqrt(x/(x+a))) = tan^(-1)().

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  17. The numerical value of 4(cot^(-1)3 + sin^(-1) 1/sqrt5) =.

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  18. The numerical value of cos{tan^(-1)(-3) + cot^(-1)(-3)} =.

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  19. The numerical value of sec^(2)(tan^(-1)2) + cosec^(2)(cot^(-1)3) =.

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  20. 2sin^(-1) (sqrt(1-x)/2) = cos^(-1)().

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