[微積] 兩題高微求助

[master791217 ( )]

學到這部分不太懂
墾請幫忙解題
謝謝~~

find the pointwise limits of sequence of functions
on the given set

1. {sin nx /1+nx }  x在[o,∞ )

2. {(cosx)^2n}      X 屬於 R



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