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OpenStudy (anonymous):
Solve the equation in the interval [0,\, 2 \pi]. If there is more than one solution write them separated by commas. Hint: To solve this problem you will have to use the quadratic formula, inverse trigonometric functions and the symmetry of the unit circle. Also, you should look at the graph of the tangent function over the interval [0,\, 2 \pi]. (\tan x) ^2 - 21 \tan(x) - 22 = 0
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