1. ## [SOLVED] which is the correct answer ?

please have a look at the aatached pic ...which is the correct procedure .....left or the right one ...and why? what is worng there?
thank you .

2. Originally Posted by crb
please have a look at the aatached pic ...which is the correct procedure .....left or the right one ...and why? what is worng there?
thank you .
There're both correct. You have forgotten the constant of integration. If you include it then you can use a trig identity to go between answers.

3. Hello,

Both of them are correct.
There's just a matter of constant.

A constant should be added to the two methods.

But note that $\cos^2(x)+K=(1-\sin^2(x))+K=-\sin^2(x)+K'$

using the identity $\cos^2+\sin^2=1$

and that's all

4. ooo the constant......i was going a bit crazy there.......thank you for helping out guys ..thank you