1-sin²(x/2-3π)-cos²(x/4)+sin²(x/4)=(1-sin²(x/2-3π))-(cos²(x/4)-sin²(x/4))=
=cos²(x/2-3π)-cos(2*(x/4))=(cos(3π-x/2))²-cos(x/2)=(-cos(x/2))²-cos(x/2)=cos²(x/2)-cos(x/2)
8х^3+8x^2+14x-8x^2=8x^3+14x
Якщо x=0,5:
8*0,125+7=1+7=8
А(х-у)+3(х-у)/(а-3)(а+3)=(х-у)(а+3)/(а+3)(а-3)=х-у/а-3 5,8-3,4/3,1-3=2,4/0,1