y=(sin²x+cos²x)+2sinxcosx+(2cos²x-1)+1=1+sin2x+cos2x+1=√2sin(2x+π/4)+21、所以T=2π/2=π2、sin的增区间是(2kπ-π/2,2kπ+π/2)所以2kπ-π/2<2x+π/4<2kπ+π/22kπ-3π/4<2x<2kπ+π/4kπ-3π/8所以增区间是(kπ-3π/8,kπ+π/8)3、y=√2sin(2x+π/4)+2=√2sin[2(x+π/8)]+2所以是向左移π/8个单位,然后向上移2个单位