Edexcel C2 — Question 4

Exam BoardEdexcel
ModuleC2 (Core Mathematics 2)
TopicTrig Equations
  1. Find all values of \(x\) in the interval \(0 \leq x < 360 ^ { \circ }\) for which
$$2 \sin ^ { 2 } x - 2 \cos x - \cos ^ { 2 } x = 1$$
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