Question

find sin 75, if sin (A+B) = sin A .cos B + cos A .sin B

Answer 1

$( \frac{1 }{2} \times \frac{1}{ \sqrt{2} } ) + ( \frac{ \sqrt{3} }{2} \times \frac{1}{ \sqrt{2} } ) \\ \\ \ \frac{1}{2 \sqrt{2} } + \frac{ \sqrt{3} }{2 \sqrt{2}$