A-Level Maths: E7-10 [Trig Equations: Solve 1/cos(x) = 5 between 360 and 720 degrees]

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Very good with the tip of adding 360 to the first 2 solutions.

davidhill
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I have a question. I have to find the range of values of k for which the equation 2cos²x - ksinx = 2 - k has no solutions. My answer is -8 < k < 1 but I just wanted to know it you would have gotten the same answer. In my textbook it shows that -8 < k < 0, so I'm a little confused.

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