1. The problem statement, all variables and given/known data I dont know how other people learned trig, but in my book, the first 2 chapters have nothing to do with angles, but are mostly circles and trig functions of real numbers. Does this make sense to anyone? I am in the next chapter already and I know there are other, easier ways of calculating trig, but in these chapters, I cant do that. I know how to show sin and cos are odd and even with a random number and a calculator, but I have to show it the way presented below. Ive googled and my book only shows the properties with answers, no worked probs. Can anyone explain to me if I am doing this right or what I am doing wrong? thanks! a few examples 1. f(x)= x2 sin x 2. f(x)= x3+ cos x 3. f(x)= xsin3x 4. f(x)= cos(sin x) 2. Relevant equations even odd properties that have all trig functions odd except cos and sec 3. The attempt at a solution 1. f(-x)= (-x)2 sin (-x) = x2 sin -x = -f(x)= odd. the answer says -x2 sin x = -f(x) = odd. why am i wrong? 2. f(-x)= (-x)3 + cos(-x) = -x3+ cos x = neither 3. (-x)sin3(-x) frankly i have no clue how to do that one. 4. cos(sin(-x)) would be cos (-x) = x = f(x) = even?????