Inequality complex exponential function
103536
How to prove $|e^{i\theta} - 1| \leq |\theta|$?
106803
How to see $\cos x \leq \exp(-x^2/2)$ on $x \in [0,\pi/2]$?
139774
On the inequality $ \int_{-\infty}^{+\infty}\frac{(p'(x))^2}{(p'(x))^2+(p(x))^2}\,dx \le n^{3/2}\pi.$
20359
Proof of radius of convergence exponential function
151410
Inequality of continuous functions
7192
Integral inequality with a strange condition
107601
Use of inequality $1 - \cos (x) \leq x^2 /2$
108995
Prove $|e^{i\theta} -1| \leq |\theta|$
89170
How prove this inequality $\frac{x^2y}{z}+\frac{y^2z}{x}+\frac{z^2x}{y}\ge x^2+y^2+z^2$
27587
inequality on the unit disk
5430
Using Cauchy's integral theorem to prove a inequality
136359
How to define a complex function with assumptions?
138360
Exponents and absolute value w/ complex numbers
112597
Extreme point of unit balls, the complex case
53998
Solving an exponential inequality problem
21753
Complex differential equation
70448
Inequality for harmonic means