q1 i cant be bothered figuring out, some1 else will
q2 change to : \frac{sin^{2}(x) + 1 - 1}{sin^{2}(x) + 1}
then simplify that to 1 - \frac{ 1}{sin^{2}(x) + 1}
then do it from q1
q3 let u = sinx
derivative/annagurl/sinoswife every1 knows who you are every time you change accounts because you always post shitloads of comments and theyre always useless meaningless boring shit
whats your name btw