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lim(x→0)tan4X/sin3X
题目详情
lim(x→0)tan4X/sin3X
▼优质解答
答案和解析
lim(x→0)sin4x/sin3x cos4x
=lim(x→0) sin4x/4x ×3x/sin3x ×1/cos4x ×4/3
=1×1×1×4/3
=4/3
=lim(x→0) sin4x/4x ×3x/sin3x ×1/cos4x ×4/3
=1×1×1×4/3
=4/3
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