\sin\alpha=0,2
\cos^2\alpha=1-\sin^2\alpha=1-0,2^2=1-0,04=0,96
\cos\alpha=\sqrt{0,96}\approx0,9798 lub \cos\alpha=-\sqrt{0,96}\approx-0,9798
\tan\alpha=\frac{\sin\alpha}{\cos\alpha}
\tan\alpha=\frac{0,2}{0,9798}\approx0,2041 lub \tan\alpha=\frac{0,2}{-0,9798}\approx-0,2041
\cot\alpha=\frac{\cos\alpha}{\sin\alpha}
\cot\alpha=\frac{0,9798}{0,2}=4,899 lub \cot\alpha=\frac{-0,9798}{0,2}=-4,899