Найдите \(\displaystyle \sin\color{red}{\alpha}\) и \(\displaystyle \cos\color{red}{\alpha}\small,\) если \(\displaystyle \tg\color{red}{\alpha}=-0{,}75\) и \(\displaystyle 90º\lt \color{red}{\alpha}\lt 180º\small.\)

\(\displaystyle \cos\color{red}{\alpha}=\)[ ]  и \(\displaystyle \sin\color{red}{\alpha}=\)[ ]