Question Number 142341 by mohammad17 last updated on 30/May/21
Commented by mohammad17 last updated on 30/May/21
$${how}\:{can}\:{solve}\:{this} \\ $$
Answered by Dwaipayan Shikari last updated on 30/May/21
$${A}.{A}={A}^{\mathrm{2}} {cos}\mathrm{0}°=\mid{A}\mid^{\mathrm{2}} \:\: \\ $$$$\:\:\left(\:\:{A}\:{and}\:{A}\:{are}\:{parallel}\:{because}\:{they}\:{are}\:{same}\right) \\ $$