Question

$\huge\purple{MATHS}$


$\frac{sin \: a}{sin \frac{a}{2} } = 2 \: cos \: \frac{a}{2}$
How ??​

Answer 1

Answer:

Sin A/sinA/2=(2 Sin A/2.CosA/2)/SIN A/2

=2COS A/2