Question

mik đang cần gấp,  giúp vs nha ^-^!!!!!!

Answer 1

a+d)

\(i:\widehat{SIN}\)

\(i':\widehat{RIN}\)

\(\Rightarrow\left\{{}\begin{matrix}i=90^o-30^o=60^o\\i=i'\Leftrightarrow i'=60^o\end{matrix}\right.\)

\(i+i'=60^o+60^o=120^o\)