Question

 Cho a,b lớn hơn 0 thoả mãn cos(2-ab)- cos(a+b)= a+b +ab -2

Tìm GTNN của P = a +2b

Answer 1

\(cos\left(2-ab\right)-cos\left(a+b\right)=a+b+ab-2\)

\(\Leftrightarrow cos\left(2-ab\right)+2-ab=cos\left(a+b\right)+a+b\)

Xét hàm \(f\left(x\right)=cosx+x\)

\(f'\left(x\right)=-sinx+1\ge0;\forall x\Rightarrow f\left(x\right)\) đồng biến trên R

\(\Rightarrow2-ab=a+b\)

\(\Rightarrow2-a=b\left(a+1\right)\Rightarrow b=\dfrac{2-a}{a+1}=\dfrac{3}{a+1}-1\)

\(\Rightarrow P=a+\dfrac{6}{a+1}-2=a+1+\dfrac{6}{a+1}-3\ge2\sqrt{\dfrac{6\left(a+1\right)}{a+1}}-3=2\sqrt{6}-3\)