x趋向于无穷 limx^2(sinθ/x)^2=θ^2求解答.

x趋向于无穷 limx^2(sinθ/x)^2=θ^2求解答.
x趋向于无穷 limx^2(sinθ/x)^2=θ^2求解答.

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