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the direction cosines of the line joinin...

the direction cosines of the line joining the points (1,2-3) and (-2,3,1) are

A

`-3,1,4`

B

`-1,5,-2`

C

`-3/sqrt26,1/sqrt26,4/sqrt26`

D

`-1/sqrt30,5/sqrt30,-2/sqrt30`

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UNITED BOOK HOUSE-SET 8-EXERCISE
  1. If f(x) = x+ 1/x , x>0 then the greatest value of f(x) is (a) -2 (b)0...

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  2. If |veca|=4,|vecb|=2 sqrt3 and |vecaxxvecb|=12 then the angle between ...

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  3. the direction cosines of the line joining the points (1,2-3) and (-2,3...

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  4. If the probability of occurrence of an event is 5/8 then the odds in f...

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  5. A fair coin is tossed 99 times. Let X be the number of times head occu...

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  6. Evaluate : sec^2(tan^(-1)2)+cosec^2(cot^(-1)3).

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  7. Prove that , |[1,logx^y,logx^z],[logy^x,1,logy^z],[logz^x,logz^y,1]|=0

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  8. If A = [[2,2],[4,3]] show that AA^(-1)=I2where I2 is the unit matrix o...

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  9. f(x) = { (kx+1, x le pi),( cos x, x >pi):} If f(x) is continous at x =...

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  10. If ye^y=x prove that (dy)/(dx)= y/(x(1+y))

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  11. Evaluate: int e^x/x(x log x+1)dx

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  12. Find the integrating factor of the differential equation xlogx (dy)/(d...

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  13. Find the acute angle between the pair of straight lines whose directio...

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  14. Find the equation of the plane which passes through the points (1,2,3)...

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  15. A random variable X has the following probability distribution: ...

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  16. If cos^(-1)x+cos^(-1)y= theta, show that x^2-2xycos theta+y^2 = sin^2 ...

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  17. If A = [[cos alpha,sin alpha],[-sin alpha,cos alpha]] then prove that,...

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  18. If tan y = (tan x+sec x-1)/(tanx -sec x+1) show that (dy)/(dx) = 1/2

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  19. Evaluate: int (dx)/(1-cos alpha cos x)(0< alpha < pi/2)

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  20. Evaluate: int ((sinx+cos x)dx)/(sin(x-a))

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