what is the answer to the problem (6t-4)-(6t2+t-2)

What is the problem?

(6t-4)-(6t2+t-2)
= 6t - 4 - 6t^2 - t + 2
= -6t^2 + 5t - 2

Why did you label this algebra2 ?
Secondly where does the trigonometry enter the picture?