$a)\sin {145}^o=\sin \left({180}^o-{35}^o\right)=\sin {35}^o\approx 0,5736\approx 0,57$  

 

$b)\cos {160}^o=\cos \left({180}^o-{20}^o\right)=-\cos {20}^o\approx -0,9397\approx -0,94$  

 

$c)\mathrm{tg}{115}^o=\mathrm{tg}\left({180}^o-{65}^o\right)=-\mathrm{tg}{65}^o\approx -2,1445\approx -2,14$  

 

$d)\sin {100}^o=\sin \left({180}^o-{80}^o\right)=\sin {80}^o\approx 0,9848\approx 0,98$  

 

$e)\mathrm{tg}{130}^o=\mathrm{tg}\left({180}^o-{50}^o\right)=-\mathrm{tg}{50}^o\approx -1,1918\approx -1,19$