求y=sin(x+π/4)的单调区间和周期

问题描述:

求y=sin(x+π/4)的单调区间和周期

T=2π/1=2π
sinx增则2kπ-π/2减是2kπ+π/2所以
2kπ-π/22kπ-3π/4所以
增区间(2kπ-3π/4,2kπ+π/4)
同理,减区间(2kπ+π/4,2kπ+5π/4)