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The angle between the lines whose direc...

The angle between the lines whose direction cosines are given by the equatios `l^2+m^2-n^2=0, m+n+l=0` is

A

`cos^(-1)(2sqrt(3))`

B

`cos^(-1)sqrt(3)`

C

`(phi)/(3)`

D

`(phi)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
(c)
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ARIHANT MATHS-THREE DIMENSIONAL COORDINATE SYSTEM-Exercise (Single Option Correct Type Questions)
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  8. The radius of the circle in which the sphere x^2+y^2+z^2+2x-2y-4z-19=0...

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  9. Let veca=hati+ hatj and vecb = 2hati-hatk . The point of intersection ...

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  10. The co-ordinate of the point P on the line r=(hat(i)+hat(j)+hat(k))+la...

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  11. The 3-dimensional vectors v1, v2, v3 satisfying v1cdotv1=4, v1cdotv2=-...

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  12. The points hat(i)-hat(j)+3hat(k) and 3hat(i)+3hat(j)+3hat(k) are equi...

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  13. A, B, C and D are four points in space. Using vector methods, prove th...

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  14. Show that x(1) hati+y(1) hatj+ z1hatk, x2hati+y2hatj+z2hatk and x3hati...

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  15. The position vectors of points of intersection of three planes rcdotn1...

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  16. A pentagon is formed by cutting a triangular corner from a rectangular...

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  17. In a dimensional coodinate a system P, Q and R are image of a point A(...

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  18. A plane 2x+3y+5z=1 has a point P which is at minimum distance from lin...

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