- #1

karush

Gold Member

MHB

- 3,267

- 4

Find x

$2\cos^2(x)=1$

$\cos^2(x)=\dfrac{1}{2}\implies

\cos(x)=\dfrac{1}{\sqrt{2}}\implies

x=\dfrac{\pi}{4}$ or $x=\dfrac{7\pi}{4}$

well its the simple ones where we stumple

not sure if it necessary to give all quadrants of possible answers

its probably better to us $\theta$ rather than x

mahalo