How to solve limx→0x−sin(x)x2 Without L'Hospital's Rule?
you can use trigonometric identities and inequalities, but you can't use series or more advanced stuff.
Answer
The given expression is odd; therefore it is enough to consider x>0. We then have
0<x−sinxx2<tanx−sinxx2=tanx 1−cosxx2=tanx2 (sin(x/2)x/2)2 ,
and right side obviously converges to 0 when x→0+.
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