Question
Find all solutions of the equation in the interval $[0,2 \pi).$$$2 \sin ^{2} x-\cos x=1$$
Step 1
We know that $\sin^2 x = 1 - \cos^2 x$, so we substitute this into the equation to get $2(1 - \cos^2 x) - \cos x = 1$. Show more…
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