ajutati ma repede va rog =(
![Ajutati Ma Repede Va Rog class=](https://ro-static.z-dn.net/files/d44/008464b7b1560412307914b780fbd1ca.jpg)
[tex]sin {}^{2} \: a - sin \: a\: b + sin \: a \: \: b - sin {}^{2} b \\ {sin}^{2} \: a - {sin}^{2} \: b[/tex]