cos(sinx)的单调区间
问题描述:
cos(sinx)的单调区间
答
求导,可得(cos(sinx))'=-sin(sinx)cosx
当x∈(2kπ,π+2kπ),时sinx>0,sin(sinx)>0
当x∈(-π+2kπ,2kπ)时,sinx当x∈(-π/2+2kπ,π/2+2kπ)时,cosx>0
当x∈(π/2+2kπ,3π/2+2kπ)时,cosx综上可得结果(打出来太麻烦了- -.)思路懂就好.