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已知函数f(x)=asinx+btanx+2,满足f(5)=7,则f(-5)的值...
已知函数f(x)=asinx+btanx+2,满足f(5)=7,则f(-5)的值为( )
A.5
B.-3
C.-5
D.-6
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=-5,那么tanα的值为( )
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