Find the integral of cos^2x dx.please help

Question

lgbasallote · Answer

[-sin^2(x)]/2

lgbasallote · Answer

it's a combination of the power rule thingy and the sinx = cosxdx thingy

perl · Answer

and the other thingy

mimi_x3 · Answer

$$\int\limits \cos^{2}x  = \frac{1}{2}(1+\cos2x)dx  = \frac{1}{2}  (x+\frac{1}{2}\sin2x)  +c$$

lgbasallote · Answer

there are a lot of thingies here, aren't there? :))

anonymous · Answer

Mimi,i understand your steps but not the next one,my final answer is
1\4sin(2x)+1/2x+c  which is wrong,it si supposed to be 1\4sin(2x)+2x+c.how do they get 2x?

lgbasallote · Answer

wolframalpha said something like 1.2(x +sinxcosx) + C haha so embarassing to admit i'm wrong..but i am :))

lgbasallote · Answer

that's 1/2

turingtest · Answer

mimi is right, so it seems your book is wrong

anonymous · Answer

you can say that again T,@ all-thax for ur help.Igbasallote dont be embarrased one who makes no  mistakes never do anything