Korzystając z tablic matematycznych lub kalkulatora podaj przybliżoną

`a)\ tgalpha=0,231\ \ \ =>\ \ \ alpha~~13^o`

`b)\ tgalpha=-0,649\ \ \ =>\ \ \ -tgalpha=0,649\ \ \ =>\ \ \ tg(180^o-alpha)=0,649\ \ \ =>\ \ \ 180^o-alpha~~33^o\ \ \ =>\ \ \ alpha~~180^o-33^o=147^o`

`c)\ tgalpha=3,271\ \ \ =>\ \ \ alpha~~73^o`

`d)\ tgalpha=-8,144\ \ \ =>\ \ \ -tgalpha=8,144\ \ \ =>\ \ \ tg(180^o-alpha)=8,144\ \ \ =>\ \ \ 180^o-alpha~~83^o\ \ \ =>\ \ \ alpha~~180^o-83^o=97^o`

`e)\ tgalpha=2,356\ \ \ =>\ \ \ alpha~~67^o`

`f)\ tgalpha=-0,81\ \ \ =>\ \ \ -tgalpha=0,81\ \ \ =>\ \ \ tg(180^o-alpha)=0,81\ \ \ =>\ \ \ 180^o-alpha=39^o\ \ \ =>\ \ \ alpha~~180^o-39^o=141^o`