求解极限,第三题,要有过程 谢谢!
展开全部
x->0
sinx ~ x- (1/6)x^3
x- sinx ~ (1/6)x^3
x+ sinx ~ -(1/6)x^3
lim(x->0) (x-sinx)/(x+sinx)
=lim(x->0) (1/6)x^3/[-(1/6)x^3]
=-1
sinx ~ x- (1/6)x^3
x- sinx ~ (1/6)x^3
x+ sinx ~ -(1/6)x^3
lim(x->0) (x-sinx)/(x+sinx)
=lim(x->0) (1/6)x^3/[-(1/6)x^3]
=-1
追问
???看不懂啊
追答
看不懂
lim(x->0) (x-sinx)/(x+sinx) (0/0)
=lim(x->0) (1-cosx)/(1+cosx) (0/0)
=lim(x->0) sinx/(-sinx)
=-1
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