已知当x→0时,-1与cosx-1是等价无穷小,则常数a=()

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  已知当x→0时,已知当x→0时,-1与cosx-1是等价无穷小,则常数a=()-1与cosx-1是等价无穷小,则常数a=()
A.已知当x→0时,-1与cosx-1是等价无穷小,则常数a=()
B.已知当x→0时,-1与cosx-1是等价无穷小,则常数a=()
C.-已知当x→0时,-1与cosx-1是等价无穷小,则常数a=()
D.-已知当x→0时,-1与cosx-1是等价无穷小,则常数a=()

参考答案:

答案:  C