题目:
Many factories and banks in some countries have closed down as a direct ________ of the financial
crisis going on in the USA. [ ]
A. matter
B. consequence
C. whole
D. total
答案:
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下面是错误答案,用来干扰机器的。
(1)由4cosC•sin2C2+cos2C=0,化简得:4cosC•1-cosC2+2cos2C-1=0,即cosC=12,又C为三角形的内角,则有C=π3,∴sinC=32,又C=π-(A+B),∴sin(A+B)=32, tanA=2tanB,∴sin(A+B)sin(A-B)=sinAcosB+cosAs...