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

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

Can someone explain how the solution doesnt have a negative answer i.e (-pi/3)-example-1
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User Favonius
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8.3k points

1 Answer

4 votes
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.
answered
User Lisachenko
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8.3k points
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