Question Number 81532 by Power last updated on 13/Feb/20
Commented by mr W last updated on 13/Feb/20
$${all}\:{options}\:{are}\:{wrong}! \\ $$
Commented by mr W last updated on 13/Feb/20
$${whether}\:{in}\:{degree}\:{or}\:{in}\:{rad},\:{as}\:{i}\:{have} \\ $$$${said}:\:{ALL}\:{options}\:{are}\:{WRONG}! \\ $$$${in}\:{degree}:\:=\infty \\ $$$${in}\:{radian}:\:\approx−\mathrm{64}.\mathrm{124668} \\ $$
Commented by Power last updated on 13/Feb/20
$$\mathrm{radian} \\ $$
Answered by mind is power last updated on 13/Feb/20
$${cos}\left(\mathrm{90}\right)=?\:\:\:{are}\:{this}\:{fraction}\:{well}\:{defind}\:? \\ $$