Răspuns:
Explicație pas cu pas:
4
E=(cos30°+sin 60°)(sin 30°-cos60°)/(sin 45°+1)(cos45°-1)=
=(√3/2+√3/2)(1/2-1/2)/(√2/2+1)(√2/2-1)=0
5
F(x)=x²-2√3x+3
F(√3-1)=(√3-1)²-2√3(√3-1)+3=3-2√3+1-6+2√3=-2
F(√3+1)=(√3+1)²-2√3(√3+1)+3=3+2√3+1-6+2√3=4√3-2
F(√3+1)-F(√3-1)=4√3-2+2=4√3 ⇒
F(√3+1)>F(√3-1)
