Cos x- 1-2 find x - 3rd quadrant

cos x= 1√(2) cos x= cosπ/4 cos x=cos 5π/4 x=5π4 ...

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cos x=- 1√2 f...

Question

$cos x = - \frac{1}{\sqrt{2}}$ find $x \in 3 r d$ quadrant

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