函数y=sinx-cosx化为正弦函数为?
问题描述:
函数y=sinx-cosx化为正弦函数为?
答
y=sinx-cosx
=√2*(√2/2*sinx-√2/2*cosx)
=√2(sinxcosπ/4-cosxsinπ/4)
=√2sin(x-π/4) .