Video narration
Motu, ei bishal chocolate-borgotar ek bahu a+b! Patlu, etake a ar b mape char bhag kori - a^2 + ab + ab + b^2. Ek koner borgoti a^2; pashe o niche thaka dui ayotokkhetra ab ar ab; shesh koner borgoti b^2. Motu, daro, duto ab? Patlu, hya, ab+ab manei 2ab! Char tukro eksathe jure dilei puro chocolate-borgotar khetrafol a^2 + 2ab + b^2. Tai (a+b)^2 mane a^2 + 2ab + b^2 - karon boro borgota ei char angshei toiri!