- Started with
\[\tan \left(x + \varepsilon\right) - \tan x\]
30.3
- Using strategy
rm 30.3
- Applied tan-cotan to get
\[\color{red}{\tan \left(x + \varepsilon\right)} - \tan x \leadsto \color{blue}{\frac{1}{\cot \left(x + \varepsilon\right)}} - \tan x\]
30.4
- Using strategy
rm 30.4
- Applied cotan-quot to get
\[\frac{1}{\color{red}{\cot \left(x + \varepsilon\right)}} - \tan x \leadsto \frac{1}{\color{blue}{\frac{\cos \left(x + \varepsilon\right)}{\sin \left(x + \varepsilon\right)}}} - \tan x\]
30.4
- Applied associate-/r/ to get
\[\color{red}{\frac{1}{\frac{\cos \left(x + \varepsilon\right)}{\sin \left(x + \varepsilon\right)}}} - \tan x \leadsto \color{blue}{\frac{1}{\cos \left(x + \varepsilon\right)} \cdot \sin \left(x + \varepsilon\right)} - \tan x\]
30.4
- Using strategy
rm 30.4
- Applied sin-sum to get
\[\frac{1}{\cos \left(x + \varepsilon\right)} \cdot \color{red}{\sin \left(x + \varepsilon\right)} - \tan x \leadsto \frac{1}{\cos \left(x + \varepsilon\right)} \cdot \color{blue}{\left(\sin x \cdot \cos \varepsilon + \cos x \cdot \sin \varepsilon\right)} - \tan x\]
28.6
- Applied distribute-lft-in to get
\[\color{red}{\frac{1}{\cos \left(x + \varepsilon\right)} \cdot \left(\sin x \cdot \cos \varepsilon + \cos x \cdot \sin \varepsilon\right)} - \tan x \leadsto \color{blue}{\left(\frac{1}{\cos \left(x + \varepsilon\right)} \cdot \left(\sin x \cdot \cos \varepsilon\right) + \frac{1}{\cos \left(x + \varepsilon\right)} \cdot \left(\cos x \cdot \sin \varepsilon\right)\right)} - \tan x\]
28.6
- Applied associate--l+ to get
\[\color{red}{\left(\frac{1}{\cos \left(x + \varepsilon\right)} \cdot \left(\sin x \cdot \cos \varepsilon\right) + \frac{1}{\cos \left(x + \varepsilon\right)} \cdot \left(\cos x \cdot \sin \varepsilon\right)\right) - \tan x} \leadsto \color{blue}{\frac{1}{\cos \left(x + \varepsilon\right)} \cdot \left(\sin x \cdot \cos \varepsilon\right) + \left(\frac{1}{\cos \left(x + \varepsilon\right)} \cdot \left(\cos x \cdot \sin \varepsilon\right) - \tan x\right)}\]
28.6
- Applied simplify to get
\[\frac{1}{\cos \left(x + \varepsilon\right)} \cdot \left(\sin x \cdot \cos \varepsilon\right) + \color{red}{\left(\frac{1}{\cos \left(x + \varepsilon\right)} \cdot \left(\cos x \cdot \sin \varepsilon\right) - \tan x\right)} \leadsto \frac{1}{\cos \left(x + \varepsilon\right)} \cdot \left(\sin x \cdot \cos \varepsilon\right) + \color{blue}{\left(\frac{\cos x \cdot \sin \varepsilon}{\cos \left(\varepsilon + x\right)} - \tan x\right)}\]
28.6