lim( x->无穷)(1+1/x)^2x
=e^lim( x->无穷)(2x/x)
=e^2
∫(sinx)^2cosxdx
=∫(sinx)^2d(sinx)
=(sinx)^3/3+C
（1）求极限lim(1+1/x)^2x x->无穷 （2)求不定积分∫sin^2cosxdx
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