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Find all solutions to the given equation in the interval [0,2π). Give the exact solution, including "pi" for π. For any unused answer boxes, enter DNE in all capital letters.
(a)
cos
2
x
−3cos
x
+ 1 = 0
x
=
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(b)
sec
2
x
− sec
x
−2 = 0
x
=
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