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]
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