вычислите
ctg 4П/3
sin(-2П/3)
cos 7П/4

1)ctg 4π/3 =ctg (π + π/3)=ctg π/3 = √3/32)sin(-2π/3)= -sin(2π/3) = - sin(π - π/3) = -sin π/3 = - √3/23)cos 7π/4 = cos(2π - π/4) = cos π/4 = √2/2

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