color(white)(xx)1color(white)(x)"degree"=pi/180color(white)(x) "radian"×1xdegree=π180xradian
=>-105color(white)(x)"degrees"=(-105pi)/180color(white)(x) "radian"⇒−105xdegrees=−105π180xradian
color(white)(xxxxxxxxxx)=(-105pi)/180color(white)(x) "radian"×××××=−105π180xradian
color(white)(xxxxxxxxxx)=(-105picolor(red)(xx15))/(180color(red)(xx15))color(white)(x) "radian"×××××=−105π×15180×15xradian
(Multiply both the numerator and denominator by color(red)1515)
color(white)(xxxxxxxxxx)=(7pi)/12color(white)(x) "radian"×××××=7π12xradian