Having Fun In Add Maths Class >< ... XD

I had learnt a new fomula today keke ... ^^ is in chapter 5 trigonometry
The Formula is "infront expired , Use Back Side Way " to solve de problem...
Becoz we are proving de question and de question half way stuck and we can't do anything than Mr.How a.k.a Add maths Teacher ^^ teach us a way to solve this problem is use de "Back Side Way" to solve it ^^ keke ... The whole class think de negative thing haha ... The whole class laugh till can't stop haha ^^ .....