已知函数f(x)=sin^2 x+√3sinxcosx+2cos^2 x,求f(x)最小正周期和单调增区间.
(2),函数f(x)的图像可以由函数y=sinx的图像经过怎样的变换得到?
f(x)=sin^2 x+√3sinxcosx+2cos^2 x,
=sin^2 x+cos^2 x+√3sinxcosx+cos^2 x,
=1+√3/2sin2x+1/2+1/2cos2x
=3/2+sin(2x+π/6)
最小正周期为:T=2π/2=π
单调增区间.
2kπ-π/20.则A1+10d>0
则可知,d>2/10
首项A1及公差都为整数,所以.d=1
则An=n-3