ДАЮ 30 БАЛІВ
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а)
[tex]2 \sin75 {}^{0} \cos75 {}^{0} [/tex]
б)
[tex] \cos {}^{2} 15 {}^{0} [/tex]
в)
[tex]1 - \sin {}^{2} \frac{\pi}{12} [/tex]
г)
[tex] \frac{2 \tan165 {}^{0} }{1 - \tan {}^{2}165 {}^{0} } [/tex]
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