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Top posts (75) All Questions Answers | Votes Newest

30 If we define $\sin x$ as series, how can we obtain the geometric meaning of $\sin x$? Mar 28 '12
17 how to strictly prove $\sin x<x$ for $0<x<\frac{\pi}{2}$ Mar 28 '12
11 give a counterexample of monoid Apr 17 '12
10 Prove at least two are not relatively prime, for any $8$ composite positive integers not exceeding $360$ Mar 22 '17
8 If a linear map $T$ has a $k$-dimensional invariant subspace, does it admit an $n-k$ invariant subspace? Mar 29 '17
6 Prove $\sum_1^{\infty} a_i^2$ convergent Dec 9 '16
6 Semiring between measure theory and abstract algebra Sep 11 '12
5 Finding $\alpha$ for $\sin(4 \alpha + \frac{\pi}{6}) = \sin (2\alpha + \frac{\pi}{5})$ Sep 13 '12
4 Some function with intermediate value property is continuous. Dec 24 '17
4 What is the relation of basis in linear algebra and basis in topology? Apr 6 '12
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