Помогите пожалуйста упростить выражение:
[tex] \frac{sin \frac{11 \pi }{12} * cos \frac{ \pi }{6} - sin \frac{11 \pi }{6}*cos(- \frac{ \pi }{12}) }{sin \frac{ \pi }{3}*sin \frac{ \pi }{12}-cos \frac{2 \pi }{3}*cos \frac{ \pi }{12} } [/tex]
(Ответ: 1)
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