1.

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)=

Answer»

`sin^(2)A+sinB+sin^(2)C`
`cos^(2)A+cos^(2)B+cos^(2)C`
`TAN^(2)A+tan^(2)B+tan^(2)C`
`cot^(2)A+ cot^(2)B+cot^(2)C`

ANSWER :A


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