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-8sin(10П/7)/cos(П/14)
-8sin(10П/7)/cos(П/14) = -8sin(3П/2 - П/14)/cos(П/14) = 8 * cos(П/14)/cos(П/14) = 8
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-8sin(10П/7)/cos(П/14) = -8sin(3П/2 - П/14)/cos(П/14) = 8 * cos(П/14)/cos(П/14) = 8