вычислите : (cos75-sin75)в квадрате
(cos75-sin75)^2=cos75^2-2*cos75*sin75+sin75^2=1-2cos75*sin75=1-sin150=1-sin(180-30)=1-sin30=1-0,5=0,5
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(cos75-sin75)^2=cos75^2-2*cos75*sin75+sin75^2=1-2cos75*sin75=1-sin150=1-sin(180-30)=1-sin30=1-0,5=0,5