sin7alfa•cos 4alfa+sin 4alfa •cos 7alfa -3sin 11alfa=?
sin2xcos3x-2sin5x+cos2xsin3x=
cos2,5xcos1,5x+cosx+sin1,5xsin2,5x=?
2(cos4x•cos7x+sin2x)+2•sin4x•sin7x=?
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