x趋向于无穷 limx^2(sinθ/x)^2=θ^2求解答.

问题描述:

x趋向于无穷 limx^2(sinθ/x)^2=θ^2求解答.

lim(sinθ/x)²/1/x² x→∞ 则θ/x→0 则(sinθ/x)²~(θ/x )² 原式=(θ/x )² /(1/x)²
=θ²