1.

The orthocentre of triangle formed by (a cos alpha, a sin alpha),(a cos beta, a sin beta),(a cos gamma, a sin gamma) is

Answer»

`(SIGMA(-acos alpha).Sigma a sin alpha)`
`(Sigmaa cos alpha, Sigma a sin alpha)`
`Sigma(-a cos alpha),Sigma(-a sin alpha)`
`(Sigma(-a cos alpha),Sigma(-ASIN alpha))`

ANSWER :B


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