崔立恒
幼苗
共回答了18个问题采纳率:88.9% 举报
(1)由题意可知
2π/ω=π,ω=2
√3=2cosθ,θ=π/6
y=2cos(2x+π/6)
(2)设P点坐标为(xp,yp),则
xp+π/2=2x0
yp=2y0=√3,即
√3=2cos(2xp+π/6)=2cos(4x0-π+π/6)
cos(4x0-5π/6)=√3/2
x0∈[π/2,π],4x0-5π/6∈[7π/6,19π/6]
4x0-5π/6=11π/6或4x0-5π/6=13π/6
x0=2π/3或x0=3π/4
1年前
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