We began class by going over the problems 16-23 on the worksheet and going over the webassign to see if you had questions. The webassign scores are posted out of 10 pts. Here is how it fell out: I ignored 2 mistakes and made your score into a 20 pt grade instead of 22; then I divided by 2. There were no extra points for students who made higher that 20/22, just a 10/10.
I passed out the reviews for the unit test NEXT BLOCK...FRIDAY!! My answers are posted below. I believe that there are two mistakes on Mr. Townsend's key, so mine is different. The different answers are on #18 (cosine is adjacent, not opposite) and Calculator part #1 where his accidentally showed work with 30 instead of 34.
You can see that my biggest glitch was on problem 16. Here is what makes it tricky: cos (5 Pi/4) IS (-root 2)/ 2. It has NOTHING TO DO WITH INVERSES. So you are finding inverse sine of (-root 2)/2. That is in Quadrant IV where sine is negative and in the correct range. So -Pi/4.
ALSO problem 14 was a bit tricky. An inverse cotangent of a negative number has to be in Quadrant II to satisfy the range. The cosine in Quadrant II will be negative. You have this same issue on problem 9, where it is inverse cotangent of a negative number, so Quadrant II, so adjacent is negative, opposite is positive.
The worksheet plus your 4.7 quiz (38 pts) should be a good review for the quiz. The test is just like the review, only the domain and range are matching (like the quiz) Good luck!
answers_to_4.7-8_review.pdf |