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x = arccos() Cosine is negative in quadrants II and III, so there are two solutions: x= and x=. These are the only two angles within 0≤x<2π whose cosine value is equal to . 2. 6cos 2 (x) + 9cos(x) -
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For those who struggle with math, equations can seem like an impossible task. However, with a little bit of practice, anyone can learn to solve them.