$\"\"$

\

Observe the figure:

\

The values of the right triangle $\"\"$ and $\"\"$ .

\

$\"\"$ (Defintion of tangent)

\

$\"\"$ (Substitute $\"\"$ and $\"\"$ )

\

$\"\"$ (Divide: $\"\"$ )

\

$\"\"$ (Inverse function)

\

$\"\"$ (Use calculator)

\

$\"\"$ .

\

$\"\"$

\

$\"\"$ .