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The value of 1/(r(1)^(2))+1/(r(2)^(2))+1...

The value of `1/(r_(1)^(2))+1/(r_(2)^(2))+1/(r_(2)^(3))+1/(r^(2))`, is

A

0

B

`(a ^(2) + b ^(2) + c ^(2))/(Delta ^(2))`

C

`(Delta ^(2))/( a ^(2) + b ^(2) + c ^(2))`

D

`(a ^(2) + b ^(2) + c ^(2))/( Delta )`

Text Solution

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The correct Answer is:
B
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DISHA PUBLICATION-TRIGONOMETRIC FUNCTIONS -EXERCISE-1
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  8. The number of points of intersection of the curves 2y =1 " and " y = "...

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  9. If pn = cos^n theta + sin^n theta then pn - p(n-2) = k p(n-4) where k

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  14. The value of 1/(r(1)^(2))+1/(r(2)^(2))+1/(r(2)^(3))+1/(r^(2)), is

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  15. In two triangle ABC and DEF, AB= DE ,BC=DF and AC =Ef then

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  16. An observer in a boat finds that the angle of elevation of a tower sta...

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  17. The angular elevation of a tower OP at a point A due south of it is 60...

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