3. Add the following expressions:(iii) l^2 + m^2 + n^2 + Im + mn + mn + nl + nl+ Im

3. Add the following expressions:(iii) l^2 + m^2 + n^2 + Im + mn + mn

1.	3. Add the following expressions:(iii) l^2 + m^2 + n^2 + Im + mn + mn + nl + nl+ Im
Answer» $\huge{\underline{\tt{QUESTION:-}}}$ ADD the following expressions: l^2 + m^2 + n^2 + IM + mn + mn + nl + nl+ Im $\huge{\underline{\tt{ANSWER:-}}}$ l^2 + m^2 + n^2 + Im + mn + mn + nl + nl+ Im $\implies$ l^2 + m^2 + n^2 + LM + lm + nl + nl + mn + mn $\implies$ l^2 + m^2 + n^2 + 2lm + 2nl + 2mn