Page 32 - Calculus for the Clueless, Calc II
P. 32
2
The area of a circle really is πr , and you haven't been lied to all these years. It's nice to know.
Example 15—
2
x = 5 tan u; dx = 5 sec u du.
Example 16—
x = 7 1/2 sec u; dx = 7 1/2 tan u sec u
du.
