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How do you find the general solutions for $\sqrt{2} cos 2 x - 5 = 0$ $sqrt{2}cos2x - 5 = 0$ ?

1 Answer

Sep 21, 2015

Solve $\sqrt{2} . cos 2 x - 5 = 0$ $sqrt2.cos 2x - 5 = 0$

Explanation:

$\sqrt{2} . cos 2 x = 5$ $sqrt2.cos 2x = 5$
$cos 2 x = \frac{5}{1.41} = 3.55$ $cos 2x = 5/1.41 = 3.55$

Impossible, because cos always < +- 1.

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