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The angle between the planes x-2y+2z=5 ...

The angle between the planes `x-2y+2z=5` and `2x-3y+6z=11` is -

A

`"cos"^(-1)(5)/(21)`

B

`"cos"^(-1)(20)/(21)`

C

`"cos"^(-1)(4)/(21)`

D

`"cos"^(-1)(4)/(7)`

Text Solution

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The correct Answer is:
B
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CHHAYA PUBLICATION-MCQ ZONE -Question Paper 6
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  2. The value of hati*(hatk xx hatj) + hatj*(hati xx hatk)+hatk*(hatj xx h...

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  3. The angle between the planes x-2y+2z=5 and 2x-3y+6z=11 is -

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  4. If |veca xx vecb|=3 and veca*vecb=4, then the value of |veca|^(2)|vec...

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  11. If y=(1)/(1+x+x^(2)+x^(3)), then the value of (d^(2)y)/(dx^(2)) at x=...

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  12. If y=sinx log("tan"(x)/(2)) then the value of (d^(2)y)/(dx^(2))+y is -

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  13. If t is a parameter and x=t^(2)+2t, y=t^(3)-3t, then the value of (d...

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  14. (d)/(dx)[sin^(2)cot^(-1)( sqrt((1-x)/(1+x)))] is equal to -

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  16. The derivative of sin^(2)x w.r.t. cos^(2)x is -

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  17. If y="cosec"^(-1)((x+1)/(x-1))+cos^(-1)((x-1)/(x+1)), then (dy)/(dx...

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  18. If y=tan^(-1)((sqrt(1+x^(2))-1)/(x)) and z=tan^(-1)((2x)/(1-x^(2))), ...

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  19. If f(x)=(1)/(1-x), then the derivative of the composite function f[f{f...

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