Proving a Trigonometric inequality
87934
Deducing $\sin x + \cos x \ge 1$ from $(\sin x + \cos x)^2 = 1 + 2 \sin x \cos x$
118687
Prove an inequality with a $\sin$ function: $\sin(x) > \frac2\pi x$ for $0<x<\frac\pi2$
49054
Show that $\left | \sin a - \sin b \right | \leq \left | a-b \right |$
20863
how do I prove this inequallity?
143072
Proving $|\sin x - \sin y| < |x - y|$
13297
Prove the following trigonometric identity without a calculator involved
114822
Prove or disprove an inequality involving complex numbers
73771
An inequality for a sum of sine functions
111903
An inequality for sides of a triangle
78528
Trigonometric fraction Inequality question
126165
Prove $|\arctan x - \arctan y|\leq |x-y|$
11499
How to show the inequality for $\int_{0}^{\pi/4}\tan^n(x) dx$
128189
Proving Integral Inequality
73987
Prove the inequality $({1+\frac{a}b})^n$ + $(1+\frac{b}a)^n$ $\geq$ $2^{n+1}$
44119
Prove that $\cos (A + B)\cos (A - B) = {\cos ^2}A - {\sin ^2}B$
56623
Stuck trying to prove an inequality
3030
Proving inequality $\frac{a}{b}+\frac{b}{c}+\frac{c}{a}+\frac{3\sqrt[3]{abc}}{a+b+c} \geq 4$