Verifying Trigonometric Identities: Math Menu Activity

I used this resource as a "redemption opportunity" for students to earn up to 30 points back on their recent trig identities quiz that they took that was very difficult. When purchasing, I didn't realize there was no answer key provided. I gave 3 stars because when I asked about a key, I was given the response that "there are typically a couple of ways students could do that and still get the correct answer". That doesn't mean that a sample key couldn't have been provided. I don't think I would have paid $2 for a worksheet that didn't come with a key had I realized beforehand. I bought it in a time crunch and I would have liked to not have had to spend time making a key. It would have been easeir to write the "other ways" on the provided key than to have to do it all myself. Just my personal opinion though. I do like that students have the autonomy to select which questions they would like to do in order to earn their points. I will grade it after I have time to make the keys to see what the average points earned was. I didn't allow them to use notes, phones, or any formula sheet while doing this worksheet as they weren't given those things on their original quiz either.