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cot^-1 (21) + cot^-1(13) + cot^-1 (8) =...

`cot^-1 (21) + cot^-1(13) + cot^-1 (8) =`

A

0

B

`cot^-1 26`

C

`pi`

D

None of these

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MODERN PUBLICATION-INVERSE-TRIGONOMETRIC FUNCTIONS-EXERCISE
  1. Range of function tan^-1 x is :

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  2. The value of cos{pi + tan^-1(-1/2)} is

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  3. cot^-1 (21) + cot^-1(13) + cot^-1 (8) =

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  4. tan(cos^-1(1/(5sqrt2)) - sin^-1(4/(sqrt17)) is

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  5. The value of sin^-1((2sqrt2)/3) + sin^-1(1/3) is equal to

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  6. Solve for x : "tan"^(-1)(1-x)/(1+x)=1/(2)"tan"^(-1)x,xgt0.

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  7. The value of sin^-1((2sqrt2)/3) + sin^-1(1/3) is equal to

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  8. If cos^(-1) ((1-a^(2))/(1+a^(2)))- cos^(-1) ((1-b^(2))/(1+b^(2))) = 2 ...

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  9. cos^-1(cos((7pi)/5) equals.

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  10. The value of sec^2 (tan^(-1)3) + cosec^2(cot^-1 2) is

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  11. If sin^-1(x/13) + cosec^-1(13/12) = pi/2 then the value of x is

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  12. Given 0 le x le 1/2, then the value of : tan[sin^-1(x/sqrt2 + (sqrt(1-...

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  13. The value of sin(2 sin^(-1)0.8) is equal to

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  14. The value of tan^-1(sqrt3/2) + tan^-1(1/sqrt3) is equal to

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  15. The value of cos(sin^-1(2/3)) is equal to

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  16. If tan^-1 2x + tan^-1 3x = pi/2, then the value of x is equal to

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  17. If sin^-1x + sin^-1 y + sin^-1z = (3pi)/2, then the value of x^9 + y^9...

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  18. 2 cos^-1 x = sin^-1(2xsqrt(1-x^2)) is valid for all value of x satisfy...

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  19. The number of real solutions of the equations: tan^-1 sqrt(x(x+1)) + s...

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  20. If cos^-1 x - cos^-1 y/2 = alpha, then 4x^2 - 4xy cos alpha + y^2 is e...

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