Question

find the value sin 15?

Answer 1

sin15°

cos(90-15)°

=cos75°

【Sin 90-●°=Cos●°】


HOPE it helps

Answer 2

$\large \underline{ \underline{ \bold{ \: Answer : \: \: \: }}}$

$\to \frac{\sqrt{3} - 1}{2 \sqrt{2} }$

$\large \underline{ \underline{ \bold{ \: Formula : \: \: \: }}}$

$\to \sin(a - b) = \sin(a) \cos(b) - \cos(a) \sin(b) </p><p>$

$\large \underline{ \underline{ \bold{ \: Explaination : \: \: \: }}}$

$\to \sin(15) \\ \\ \to \sin(45 - 30) \\ \\ \to\sin(45) \cos(30) - \cos(45) \sin(30) \\ \\ \to\frac{1}{ \sqrt{2} } \times \frac{ \sqrt{3} }{2} - \frac{1}{ \sqrt{2} } \times \frac{ 1 }{ 2} \\ \\ \to \frac{ \sqrt{3} }{2 \sqrt{2} } - \frac{1}{2 \sqrt{2} } \\ \\ \to \frac{\sqrt{3} - 1}{2 \sqrt{2} }$