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 the circum circle and nine point circle cut orthogonally then sum(cos2A)=

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

Answer :D


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