lim(x→0)tanx-sinx⼀ln(1+x^3) 利用等价无穷小求解?

2025-01-21 15:24:20
推荐回答(1个)
回答1:

lim(x→0)(tanx-sinx)/ln(1+x^x^x),
=lim(x→0)(tanx-sinx)/x^3(这是0/0型,运用洛必达法则)
=lim(x→0)(sec^2x-cosx)/(3x^2)
=lim(x→0)(1-cos^3x)/(3x^2*cos^2x)
=lim(x→0)(1-cos^3x)/(3x^2)(这是0/0型,运用洛必达法则)
=lim(x→0)(3cos^2xsinx)/(6x)
=lim(x→0)(sinx)/(2x)
=1/2