Question 1197388
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(1) SEC(x) is 1/COS(x).<br>
(2) An angle of -π/6 (-30 degrees) is in quadrant IV, with a reference angle of 30 degrees.<br>
(3) The cosine of the reference angle is sqrt(3)/2.<br>
(4) Cosine is positive in quadrant IV, so COS(-π/6) is sqrt(3)/2.<br>
(5) So SEC(-π/6) is 2/sqrt(3).<br>