Kąt \(\alpha\) jest ostry i \(\cos \alpha = \frac{3}{5}\). Wtedy
A.\( \sin \alpha \cdot \operatorname{tg} \alpha = \frac{16}{15} \)
B.\( \sin \alpha \cdot \operatorname{tg} \alpha = \frac{15}{16} \)
C.\( \sin \alpha \cdot \operatorname{tg} \alpha = \frac{8}{15} \)
D.\( \sin \alpha \cdot \operatorname{tg} \alpha = \frac{6}{20} \)