Math, asked by badalkumarsaha2, 1 year ago

8 cos 3 theta - 6 vos theta =1 prove theta= pie /9

Answers

Answered by pushpakala086

1

HEYA !!!!

L.H.S=8cos3(π9)−6cos(π9)

=2cos(π9)[4cos2(π9)−3]

=2cos(π9)[2+2cos(2π9)−3]

=2cos(π9)[2cos(2π9)−1] .

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