finally

Finally,our school first exam was finished....
I think some subject (especially mathematics)will fail!
that was very difficult!
what is sinXX,tanXX,cosXX.
I always thinks about this issues....Are Mathematics very useful for my future??
I think is useless and such like a rubbish thing ever!
My mathematics not bad,though.LOL
We will use mathematics such like sin,tan,cos in our future life even when we buy food in restaurant?
oh god,that's ridiculous!
I will never touch mathematics after senior graduate!