4sin^2x+2cos^2x-3=0 whats x
$$\\4sin^2x+2cos^2x-3=0\\ 4sin^2x+2[1-sin^2x]-3=0\\ 4sin^2x+2-2sin^2x-3=0\\ 2sin^2x-1=0\\ 2sin^2x=1\\ sin^2x=\frac{1}{2}\\ sinx=\pm\;\frac{1}{\sqrt2}\\ x=180n\pm\;45\quad degrees\qquad n\in Z \qquad $ (n is an integer)$$$
2cos^2 x+4sinx cosx =?
