(3d+5c)и все это в квадрате-(3d-5с)и все это в квадрате.упростите
(3d+5c)^2-(3d-5c)^2 = ((3d+5c)-(3d-5c))((3d+5c)+(3d-5c))=(3d+5c-3d+5c)(3d+5c+3d-5c)=
=10c*6d = 60cd
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(3d+5c)^2-(3d-5c)^2 = ((3d+5c)-(3d-5c))((3d+5c)+(3d-5c))=(3d+5c-3d+5c)(3d+5c+3d-5c)=
=10c*6d = 60cd