Ответы на вопрос:
3,1
Объяснение:
3(х+1,5)+2(3+х)=-5
3х+4,5+6+2х=-5
3х+2х=-5-4,5-6
5х=15,5
х=15,5:5
х=3,1
Tg240° = tg(270° - 30°) = ctg30° = √3 ctg225° = ctg(270° - 45°) = tg45° = 1 tg240° * ctg225° = √3 sin2x = 2sinxcosx 6sin75° * cos75° = 3 * (2sin75°cos75°) = 3 * sin(2 * 75°) = 3sin150° = 3sin(180° - 30°) = 3sin30° = 3 * 1/2 = 3/2 6sin75° * cos75° - tg240° * ctg225° = 3/2 - √3
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