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由於M(-π,-2)在影像上,把M的座標代入解析式得 -2=2sin(-π/3+A) sin(-π/3+A)=-1 所以-π/3+A=3π/2+2kπ,k∈Z 則A=11π/6+2kπ,k∈Z 由於-π/2
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