1.

Circum circle of a Delta^("le")ABC is a circle passing through the vertices, Nine point circle is circum circle of pedal triangle and its centre N is midpoint of circum centre and ortho centre of Delta^("le")ABC then If nine point circle touches circum circle then sum(Cos2A)

Answer»

0
`(1)/(2)`
`-1`
1

Answer :C


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