已知函数f(x)=2sinxcosx+2√3cos2x-√3,x∈R(Ⅰ)化简函...

2025-01-03 22:14:54
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回答1:

解:(I)f(x)=sin2x+√3(cos2x+1)-√3=sin2x+√3cos2x=2sin(2x+π3),
∵ω=2,∴T=π;
(Ⅱ)由第一问确定的函数解析式及f(A)=1,得到2sin(2A+π3)=1,
∴sin(2A+π3)=12,
∵A为锐角,∴A=π4,
∵AB•AC=√2,
∴bccosA=√2,即bc=2,
则S△ABC=12bcsinA=√22.