Question

Simplify the following cos(-x)tanx

Answer 1

$\bf \textit{symmetry identites}\\\\ cos(-\theta)=cos(\theta)\\\\ -----------------------------\\\\ cos(-x)tan(x)\implies cos(-x)\cdot \cfrac{sin(x)}{cos(x)}\\\\\\ cos(x)\cdot \cfrac{sin(x)}{cos(x)}\implies sin(x)$