Can someone explain how the solution doesnt have a negative answer i.e (-pi/3)

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asked Sep 16, 2018 162k views

1 Answer

Lisachenko · Answer 1 · 2018-09-23T10:32:59+0000

As far as I can tell you are correct. The correct answer for x should be
-pi/3

If you plug x=+pi/3 into the expression cos(x/2 + pi/6), it ends i equaling 1/2, not 0.

Can someone explain how the solution doesnt have a negative answer i.e (-pi/3)

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