利用二倍角公式和辅助角公式
f (x)=-根号2sin²x+根号2sinxcosx
=-(√2/2)(1-cos2x)+(√2/2)sin2x
=(√2/2)sin2x+(√2/2)cos2x-√2/2
=sin2x*cos(π/4)+cos2x*sin(π/4)-√2/2
=sin(2x+π/4)-√2/2
f (x)=-根号2sin²x+根号2sinxcosx 怎么化简、、
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