Question

express sinA interms of tanA

Answer 1

☛ Start with the ratio identity involving sine, cosine, and tangent, and multiply each side by cosine to get the sine alone on the left.

$\frac{ \sin( \alpha ) }{ \cos( \alpha ) } = \tan( \alpha )$
$\sin( \alpha ) = \tan( \alpha ) \times \cos( \alpha )$



☛ Replace cosine with its reciprocal function.

$\sin( \alpha ) = \tan( \alpha ) \frac{1}{ \sec( \alpha ) }$