Question

cos^3/sin^3 =0.(answer this according to class 10

Answer 1

$\frac{ { \cos( \alpha ) }^{3} }{ { \sin( \alpha ) }^{3} } = 0$
${ \cos( \alpha ) }^{3} = 0( { \sin( \alpha ) }^{3} )$
${ \cos( \alpha ) }^{3} = 0$
$\sqrt[ {3}]{ { \cos( \alpha ) }^{3} } = \sqrt[3]{0}$
$\cos( \alpha ) = 0$
$\cos( \alpha ) = \cos( {90}^{o} )$
$\alpha = {90}^{o}$