已知f(x)=x^3+2x,對(duì)任意a∈R,不等式f(cos2a-3)+f(2m-sina)>0恒成立,求實(shí)數(shù)m的取值范圍
已知f(x)=x^3+2x,對(duì)任意a∈R,不等式f(cos2a-3)+f(2m-sina)>0恒成立,求實(shí)數(shù)m的取值范圍
數(shù)學(xué)人氣:197 ℃時(shí)間:2020-07-04 06:51:32
優(yōu)質(zhì)解答
易得:f(x)為奇函數(shù),且f(x)在R上遞增原不等式化為:f(cos2a-3)>-f(2m-sina)因?yàn)閒(x)為奇函數(shù),所以,-f(2m-sina)=f(sina-2m)不等式化為:f(cos2a-3)>f(sina-2m)因?yàn)閒(x)為增函數(shù)所以:cos2a-3>sina-2m2m>-cos2a+sina+3...
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