Given that sin3A=sinA

\

We have a formula that $\"\"$

\

Substitute the value of sin3A in given equation \ \

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Therefore the obtained angles are

\

$\"\"$