$$- \frac{\sin{\left (a \right )}}{\cos{\left (a \right )}}$$
sin(pi + a)/sin(pi/2 - a)
Рациональный знаменатель
[src]$$- \frac{\sin{\left (a \right )}}{\cos{\left (a \right )}}$$
Объединение рациональных выражений
[src] -sin(a)
-------------
/pi - 2*a\
sin|--------|
\ 2 /
$$- \frac{\sin{\left (a \right )}}{\sin{\left (\frac{1}{2} \left(- 2 a + \pi\right) \right )}}$$
$$- \tan{\left (a \right )}$$
$$- \frac{\sin{\left (a \right )}}{\cos{\left (a \right )}}$$
$$- \frac{\sin{\left (a \right )}}{\cos{\left (a \right )}}$$
sin(pi + a)
-----------
cos(a)
$$\frac{\sin{\left (a + \pi \right )}}{\cos{\left (a \right )}}$$
Тригонометрическая часть
[src]$$- \tan{\left (a \right )}$$
$$- \frac{\sin{\left (a \right )}}{\cos{\left (a \right )}}$$