Proving the bounds of the cosine sequence without starting with basic trig identities.
135895
Proving the bounds of cosine
119891
Divisibility and the Fibonacci sequence
69207
Approximating the locations of the extrema of the sinc function
129299
Fibonacci sequence and Euclidean algorithm's connection.
141645
Trigonometric series sum proof
114411
Simple Proof of the Euler Identity $\exp{i\theta}=\cos{\theta}+i\sin{\theta}$
45386
Fibonacci sequence emerging from integer partitioning
127882
Proofs involving orthonormal basis
27954
Prove triangle inequality using the properties of absolute value
45460
Proof verification of a number theory problem involving sequences.
58932
Hard contest type trigonometry proof
90556
Proof of the unbounded-ness of $\sum_{n\geq 1}\frac{1}{n}\sin\frac{x}{n}$
64885
Irrational and rational sequence proof
58187
Solve the sequences inequality
39752
Is there a limit of $\cos(n!)$?
48225
Proving that $\sin1 $(radian) is irrational without using Taylor Series Expansion.
11335
Proving Binomial Identity without calculus