a,b为正实数,a+b=1,求1/(a^4+1)+1/(b^4+1)取值范围
问题描述:
a,b为正实数,a+b=1,求1/(a^4+1)+1/(b^4+1)取值范围
答
a+b=1
设a=sin2A,b=cos2A.
1/(a^4+1)+1/(b^4+1)=1/(sinA^8+1)+1/(cosA^8+1)然后利用三角函数化简试试谢谢,麻烦您化简,教教我