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ctg(A-B)=(ctgActgB+1)/(ctgB-ctgA)

啊啊是谁都对 6/30 Bar 數學

ctg(A+B)=(ctgActgB-1)/(ctgB+ctgA)

啊啊是谁都对 6/30 Bar 數學

tan(A-B)=(tanA-tanB)/(1+tanAtanB)

啊啊是谁都对 6/30 Bar 數學

tan(A+B)=(tanA+tanB)/(1-tanAtanB)

啊啊是谁都对 6/30 Bar 數學

cos(A-B)=cosAcosB+sinAsinB

啊啊是谁都对 6/30 Bar 數學

cos(A+B)=cosAcosB-sinAsinB

啊啊是谁都对 6/30 Bar 數學

sin(A-B)=sinAcosB-sinBcosA

啊啊是谁都对 6/30 Bar 數學

sin(A+B)=sinAcosB+cosAsinB

啊啊是谁都对 6/30 Bar 數學

b2-4ac<0 注：方程没有实根，有共轭复数根

啊啊是谁都对 6/30 Bar 數學

b2-4ac>0 注：方程有两个不等的实根

啊啊是谁都对 6/30 Bar 數學

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