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If p(1),p(2),p(3) are altitudes of a tri...

If `p_(1),p_(2),p_(3)` are altitudes of a triangle ABC from the vertices A,B,C and `triangle` the area of the triangle, then `p_(1)^(-2)+p_(2)^(-2)+p_(3)^(-2)` is equal to

A

`(cot A+cos B+cot C)/(Delta)`

B

`(Delta)/(cot A+cos B+cot C)`

C

`Delta (cot A+cos B+cot C)`

D

none of these

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The correct Answer is:
A
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OBJECTIVE RD SHARMA ENGLISH-PROPERTIES OF TRIANGLES AND CIRCLES CONNECTED WITH THEM-Chapter Test
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  15. ln a triangle ABC, B=90^@ then the value of tan(A/2)=

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