In 1-22, use the Principle of Mathematical Induction to show that the given statement is true for all natural numbers n. 4 + 3 + 2 + ... + (5 - n) = 2n(9 - n)

L33 - 6 ▯ π 2 ex. Evaluate sinxd x and sketch the area represented 0 by this deﬁnite integral. ▯ ln2 ex. Evaluate e3xdx. 0