- Started with
\[\tan \left(x + \varepsilon\right) - \tan x\]
15.4
- Using strategy
rm 15.4
- Applied tan-quot to get
\[\tan \left(x + \varepsilon\right) - \color{red}{\tan x} \leadsto \tan \left(x + \varepsilon\right) - \color{blue}{\frac{\sin x}{\cos x}}\]
15.3
- Applied tan-cotan to get
\[\color{red}{\tan \left(x + \varepsilon\right)} - \frac{\sin x}{\cos x} \leadsto \color{blue}{\frac{1}{\cot \left(x + \varepsilon\right)}} - \frac{\sin x}{\cos x}\]
15.3
- Applied frac-sub to get
\[\color{red}{\frac{1}{\cot \left(x + \varepsilon\right)} - \frac{\sin x}{\cos x}} \leadsto \color{blue}{\frac{1 \cdot \cos x - \cot \left(x + \varepsilon\right) \cdot \sin x}{\cot \left(x + \varepsilon\right) \cdot \cos x}}\]
15.3
- Applied simplify to get
\[\frac{\color{red}{1 \cdot \cos x - \cot \left(x + \varepsilon\right) \cdot \sin x}}{\cot \left(x + \varepsilon\right) \cdot \cos x} \leadsto \frac{\color{blue}{\cos x - \cot \left(\varepsilon + x\right) \cdot \sin x}}{\cot \left(x + \varepsilon\right) \cdot \cos x}\]
15.3
- Using strategy
rm 15.3
- Applied cotan-quot to get
\[\frac{\cos x - \color{red}{\cot \left(\varepsilon + x\right)} \cdot \sin x}{\cot \left(x + \varepsilon\right) \cdot \cos x} \leadsto \frac{\cos x - \color{blue}{\frac{\cos \left(\varepsilon + x\right)}{\sin \left(\varepsilon + x\right)}} \cdot \sin x}{\cot \left(x + \varepsilon\right) \cdot \cos x}\]
15.4
- Applied taylor to get
\[\frac{\cos x - \frac{\cos \left(\varepsilon + x\right)}{\sin \left(\varepsilon + x\right)} \cdot \sin x}{\cot \left(x + \varepsilon\right) \cdot \cos x} \leadsto \frac{\cos x - \frac{\cos \left(\frac{1}{x} + \frac{1}{\varepsilon}\right)}{\sin \left(\varepsilon + x\right)} \cdot \sin x}{\cot \left(x + \varepsilon\right) \cdot \cos x}\]
14.3
- Taylor expanded around inf to get
\[\frac{\cos x - \frac{\color{red}{\cos \left(\frac{1}{x} + \frac{1}{\varepsilon}\right)}}{\sin \left(\varepsilon + x\right)} \cdot \sin x}{\cot \left(x + \varepsilon\right) \cdot \cos x} \leadsto \frac{\cos x - \frac{\color{blue}{\cos \left(\frac{1}{x} + \frac{1}{\varepsilon}\right)}}{\sin \left(\varepsilon + x\right)} \cdot \sin x}{\cot \left(x + \varepsilon\right) \cdot \cos x}\]
14.3
- Applied simplify to get
\[\frac{\cos x - \frac{\cos \left(\frac{1}{x} + \frac{1}{\varepsilon}\right)}{\sin \left(\varepsilon + x\right)} \cdot \sin x}{\cot \left(x + \varepsilon\right) \cdot \cos x} \leadsto \frac{\cos x - \frac{\cos \left(\frac{1}{\varepsilon} + \frac{1}{x}\right)}{\frac{\sin \left(\varepsilon + x\right)}{\sin x}}}{\cos x \cdot \cot \left(\varepsilon + x\right)}\]
14.3
- Applied final simplification