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∵在△ABC中,a=7,b=43,c=13,∴c為最小邊,可得C為最小角由余弦定理,得cosC=a2+b2−c22ab=49+48−132×7×43=32∵C為三角形的內角,可得C∈(0,π),∴C=π6,即為△ABC的最小角為π6.故選:B
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