$\"\"$

\

The trigonometric identity is $\"\"$ .

\

Consider $\"\"$ .

\

Rewrite the above identity

\

$\"\"$

\

Pythagorean identity: $\"Syntax$ .

\

Trigonometry identity: $\"\"$ . \ \

\

$\"\"$

\

$\"\"$

\

$\"equal$

\

$\"\"$ .

\

$\"\"$

\

$\"\"$ .