Вычислите
[tex]cos \frac{11 \pi }{56} cos \frac{3 \pi }{56} -sin \frac{11 \pi }{42}sin \frac{17 \pi }{42} [/tex]
[tex]cos \frac{11 \pi }{56} cos \frac{3 \pi }{56} -sin \frac{11 \pi }{42}sin \frac{17 \pi }{42} [/tex]
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