№710 1) = [cosα+3*(-1)+cos180*cosα+sin180*sinα] / [-tan60-cos120-(-tan60)] =
= [cosα-3+(-cosα)+0] / [-√3 - (-1/2) + √3 ] = -3 : (-1/2) =-3*2=-6
3) = cosα* [(tanα-tan180) / (1+tanα*tan180)] - (-tanα) : [cos180*cosα + sin180*sinα] =
= cosα * sinα/cosα + tanα/(-cosα) =
= sinα + (sinα/cosα) / (-cosα) = sinα-sinα/cos²α =
= [cos²α*sinα-sinα] / cos²α = [sinα*sin²α] / cos²α = sin³α / cos²α = tan²α * sinα