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Question 16
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Solve, for
−180≤x≤180-180 \leq x \leq 180
−
180
≤
x
≤
180
, the equation,
2cos2x+7cosx=0 2 \cos 2x + 7 \cos x = 0
2
cos
2
x
+
7
cos
x
=
0
[5]
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