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If alpha,beta,gamma, are lengths of the ...

If `alpha,beta,gamma`, are lengths of the altitudes of a triangle ABC with area `Delta `, then `Delta^2/R^2(1/alpha^2+1/beta^2+1/gamma^2)=`

A

`sin^2A+sin^2B+sin^2C`

B

`cos^2A+cos^2B+cos^2C`

C

`tan^2A+tan^2B+tan^2C`

D

`cot^2A+cot^2B+cot^2C`

Text Solution

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The correct Answer is:
A
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