Library/Rochester/setTrig07Identity/srw7_1_39.pg #1432

Problem Seed: 167

Since one must take a square root, the answer should be ABS($ans1) or perhaps +=$ans1. If so, it needs a brief HINT to remind students what to think about what happens when you take a square root.

Also, it's pretty boring. Perhaps to dress it up just a bit why not replace the argument either a random selection of variables (t,x,u,theta, etc.) or even to use f($r * t) for various postive $r. $0.02.

JT