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a. (2cosx-1)(cosx+2)=0
cosx=1/2 or cosx=-2
x={π/3, 5π/6}
This is correct, i promise...

i got the answer but what is the corresponding angle for -2 on the unit circle?

ok thanks

solve equation 2

You can divide both sides by cos x and remember sinx/cosx = tan x

but on the right it is sqrt cosx

No, it's sqrt(3) * cosx

no look at the problem up top

so what will be the answer for sqrt 3 on the unit circle?

Remember that special triangle with sides of a, 2a and a√3?

is it pi/6

no its pi/3 right or wrong?

60 degrees, or pi/3

thanks mayne

why is equation 2 not considered to be an identity?