Найдите значение выражения:
1)[tex] \sqrt{32}cos^2 \frac{ \pi }{8}- \sqrt{8} [/tex]
2)[tex] \sqrt{75}cos^2 \frac{7 \pi }{12}- \sqrt{75}sin^2 \frac{7 \pi }{12} [/tex]
3)[tex] \sqrt{48}- \sqrt{192} sin^2 \frac{19 \pi }{12} [/tex]

1)4√2*(1+сosπ/4)/2 -2√2=2√2(1+√2/2)-2√2=2√2+2-2√2=22)5√3*(cos²7π/12-sin²7π/12)=5√3*cos7π/6=5√3cos(π+π/6)=-5√3cosπ/6=-5√3*√3/2==-7,53)4√3-8√3sin²19π/12=4√3(1-2sin²19π/12)=4√3cos19π/6=4√3cos(3π+π/6)==-4√3cosπ/6=-4√3*√3/2=-6