Kąt \(\alpha \) jest ostry i \(\sin \alpha =0{,}6\). Wówczas
A.\( \cos \alpha =0{,}8 \) i \(\operatorname{tg} \alpha =0{,}4\)
B.\( \cos \alpha =0{,}4 \) i \(\operatorname{tg} \alpha =1{,}5\)
C.\( \cos \alpha =0{,}8 \) i \(\operatorname{tg} \alpha =0{,}75\)
D.\( \cos \alpha =0{,}4 \) i \(\operatorname{tg} \alpha =0{,}75\)