3 years ago

Cos(2x) - 3cos(x) + 2= 0 ??

1 answer:

3 0

Ignore above
your equation is 2(cosx)^2-3cosx+1=0
use quadratic formula to get results
you will end up with
cosx=1 or cosx=1/2
so, x=0 or x=pi/3

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