# Trigonometric functions

In right triangle is:

Determine the value of s and c:

$\text{ tg} \ \alpha = \dfrac{ 2} 1$

Determine the value of s and c:

$\text{ sin } \alpha = \dfrac{ s} { \sqrt{ 5 }}$

$\text{ cos } \alpha = \dfrac{ c} { \sqrt{ 5 }}$

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