[tex]\frac{3cos\alpha-2sin\alpha}{sin\alpha-5cos\alpha}=\frac{\frac{3cos\alpha}{cos\alpha}-\frac{2sin\alpha}{cos\alpha}}{\frac{sin\alpha}{cos\alpha}-\frac{5cos\alpha}{cos\alpha}}=\frac{3-2tg\alpha}{tg\alpha-5}=\frac{3-2\cdot0,4}{0,4-5}=\frac{3-0,8}{-4,6}=\frac{2,2}{-4,6}=-\frac{11}{23}[/tex]
