标签：size use osx sqrt because 范围 font $$ cos
求$sinx(\sqrt{cos^2x+24}-cosx)$的范围.
解答:[-5,5]
$$\because (sinx \sqrt{cos^2x+24}-cosxsinx)^2$$
$$\le (sin^2x+cos^2x)(cos^2x+24+sin^2x)=25$$
标签：size use osx sqrt because 范围 font $$ cos
原文地址：http://www.cnblogs.com/mathstudy/p/7535243.html
