已知向量a=(2cosx/2,tan(x/2+π/4)),b=(√2sin(x/2+π/4),tan(x/2-π/4))
1个回答
f(x)=2√2sin(x/2+π/4)cos(x/2)-1
=2(sin(x/2)+cos(x/2))cos(x/2)-1
=sinx+cosx
f(x)+f'(x)=2cosx=0
x=π/2
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