1) Упростите выражение [tex] 2^{log_{2} 3}+ log_{7} 2- log_{7} 14 [/tex]

2) Упростите выражение [tex] -3sin^{2} \alpha -6-3cos^{2} \alpha [/tex]

3) Найдите значение cos [tex] \alpha [/tex] , если sin [tex] \alpha [/tex] = [tex] \frac{\sqrt{2}}{3} [/tex] b 0<[tex] \alpha [/tex] <[tex] \frac{\pi}{2} [/tex]
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