For which values of $x$, $0$°$≤x \cos x$?
62522
Sine is algebraically less than cosine in given interval.
117331
Find the minimum value of $|\sin x+\cos x+\tan x+\cot x+\sec x+\csc x|$ for real numbers $x$
55179
How to find the exact value of $ \cos(36^\circ) $?
107601
Use of inequality $1 - \cos (x) \leq x^2 /2$
82321
Is $\cos(x) \geq 1 - \frac{x^2}{2}$ for all $x$ in $R$?
63710
For x < 5 what is the greatest value of x
105774
How is $ \cos (\alpha / \beta) $ expressed in terms of $\cos \alpha $ and $ \cos \beta $?
59791
Determine the exact value of equations involving more two trig variables
144859
Finding parameters for $f(x) = x^2 + 2(m − a)x + 3am −2 = 0$ that satisfy a condition.
155493
Minimum value of the expression given below.
77669
Limits of trig functions
46378
Trig substitution; why can we ignore the absolute value?
138195
An inequality for arctan$x$
142114
Limit as $x\to 2$ of $\frac{\cos(\frac \pi x)}{x-2} $
106013
Given $f(x) = x + |x|$ for what values of $x$ is $f$ differentiable
44715
Exact value for $\cos 36°$
88989
Why $x<\tan{x}$ while $0<x<\frac{\pi}{2}$?