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If (0,0) is orthocentre of triangle form...

If (0,0) is orthocentre of triangle formed by `A(cos alpha, sin alpha), B(cos beta, sin beta)` and `C(cos gamma, sin gamma)` then `/_BAC` is

A

`60^@`

B

`30^@`

C

`45^@`

D

`22(1^@)/(2)`

Text Solution

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The correct Answer is:
A
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