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已知tanB=,则cotA、cotB、cotC( ) A.成等差数列 B.成等比...
已知tanB=
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,则cotA、cotB、cotC( )
A.成等差数列
B.成等比数列
C.既是等差数列又是等比数列
D.既不是等差数列又不是等比数列
考点分析:
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