函数f(x)=sin2x-cos2x,怎么化简到f(x)=√2sin(2x-π⼀4)的..求解

2024-11-18 08:29:31
推荐回答(2个)
回答1:

f(x)=sin2x-cos2x
=√2*[sin2x*(√2)/2 - cos2x*(√2)/2]
=√2*[sin2x*cos(π/4) -cos2x*sin(π/4)]
=√2*sin(2x-π/4)

回答2:

f(x)=sin2x—cos2x=sin2xcos(π/4)—cos2xsin(π/4)=√2sin(2x-π/4)