1、因为sinx,x在[2kπ-π/2,2kπ+π/2]上是增函数,在[2kπ+π/2,2kπ+3π/2]是减函数,所以y=1+sinx在[2kπ-π/2,2kπ+π/2]上是增函数,在[2kπ+π/2,2kπ+3π/2]是减函数 k是整数2、因为cosx,x在[2kπ,2kπ+π]是减...