Solving $(\cos x-\sin x)\left(2 \tan x+\frac{1}{\cos x}\right)+2=0$
104319
Real solution of $(\cos x -\sin x)\cdot \bigg(2\tan x+\frac{1}{\cos x}\bigg)+2=0.$
86169
How do I solve this limit: $\lim _{x \to 0} \left(\frac{ \sin x}{x}\right)^{1/x}$?
29604
How to solve $\sin x +\cos x = 1$?
144329
Help solving a limit in two parts $\lim_{t\to 0}\left(\frac{1}{t\sqrt{1+t}}-\frac{1}{t}\right)$
39461
What is the solution of $\cos(x)=x$?
12442
Solution of tanx = x?
40869
Solving Trigonometric Limits
139022
Solve For X inside arc-cos function (with division)
117331
Find the minimum value of $|\sin x+\cos x+\tan x+\cot x+\sec x+\csc x|$ for real numbers $x$
7296
Prove $(1-\cos x)/\sin x = \tan x/2$
146594
Prove that $\frac{d}{dx}(\tan^{-1}(x))=\frac{1}{1+x^2}dx$
148624
Replacing Tan[x] with Sin[x]/Cos[x]
11059
Verify the identity: $\tan^{-1} x +\tan^{-1} (1/x) = \pi /2$
33905
Prove the following trigonometric identity: $\frac{\tan A+\sec A-1}{\tan A-\sec A+1}=\frac{1+\sin A}{\cos A}$
23485
Solving $\forall x \in \mathbb{R}_+^*, f'(x) = f\left(\frac1{x}\right)$
9539
$\alpha$ and $\beta$ are solution of $a \cdot \tan\theta + b \cdot \sec\theta = c$ show $ \tan(\alpha + \beta) = \frac{2ac}{a^2 - c^2}$
79684
Finding $\lim \limits_{x \to 0} \frac{1 - \cos x}{x}$, given $\lim \limits_{x \to 0} \frac{\sin x}{x} = 1$