MATH 126 - INTEGRAL CALCULUS (MIDYEAR) ACTIVITY 9 : DEFINITE INTEGRAL I. Evaluate the following. 1. ∫ 1
6
​
12x 3
−9x 2
+2dx 2. ∫ 1
4
​
t
​
8
​
−12 t 3
​
dt 3. ∫ 0
π
​
sec(z)tan(z)−1dz