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sin²β+cos²β=1
sin²β+16/49=1
sin²β=33/49
sinβ=√33/7
tgβ=sinβ/cosβ
tgβ=√33/7*7/4=√33/4
cosβ*sinβ+4/7 tgβ=4/7*√33/7+4/7*√33/4=4√33/49+√33/7=
4√33/49+7√33/49=11√33/49