The first one is correct IF you square the entire denominator.
Then use cos^2(x) + sin^2(x)=1 AND reduce.
You need the chain rule on the second one.
I need help to differentate these 2 questions. Thanks for your help in advance.
y = sinx/1+cosx
For this one, i tried the quotient rule and ended off with cosx + cos^2(x) + sin^2(x)/ 1+cosx^2 which is not the right answer.
y = cos(sin2x)
I tried product rule and for the wrong answer.