(根号3tan12度-3)/(sin12度(4cos^212度-2))

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(根号3tan12度-3)/(sin12度(4cos^212度-2))(根号3tan12度-3)/(sin12度(4cos^212度-2))(根号3tan12度-3)/(sin12度(4cos^212

(根号3tan12度-3)/(sin12度(4cos^212度-2))
(根号3tan12度-3)/(sin12度(4cos^212度-2))

(根号3tan12度-3)/(sin12度(4cos^212度-2))
原式=(√3sin12/cos12-3)/2sin12*cos24=[√3(sin12-√3cos12)]/sin24*cos24=2√3*2(1/2sin12-√3/2cos12)/sin48=4√3sin(12-60)/sin48=-4√3