P
prince_night_ts


tìm min, max
a) A=2.$sin^2 x$- cos2x
b) B=sin(x+$\dfrac{\pi}{4}$).sin(x-$\dfrac{\pi}{4}$
thân....
a) A=2.$sin^2 x$- cos2x
b) B=sin(x+$\dfrac{\pi}{4}$).sin(x-$\dfrac{\pi}{4}$
thân....