Question

solve integral cos^2(2x)

Answer 1

\[\int\limits \cos^2(2x)\]

Answer 2

dx

Answer 3

you know the relation for cos 2x ?

Answer 4

i use: 1+cos2x/2

Answer 5

that is how it's being solved in my textbook

Answer 6

ok, so
cos^2 2x will be (1+cos 4x)/2 right ?

Answer 7

then the answer should be \[\frac{ x }{ 2 } + \frac{ \sin2x }{ 4 }\] + k

Answer 8

oh, it's cos4x/2?

Answer 9

2nd term = cos 4x/2
its integral = (1/2) sin 4x /4
ok ?

Answer 10

yes, 2nd term is (cos 4x )/2 any doubts ?

Answer 11

yes, i'm checking

Answer 12

it appears my professor wrote it wrong

Answer 13

and i've been stuck for hours

Answer 14

2nd term = cos 4x/2
its integral = (1/2) sin 4x /4
got this ?

Answer 15

yes yes, i got it now

Answer 16

good :) ask if any more doubts anywhere ...

Answer 17

nope, i'll try and solve it again and thank you!

Answer 18

welcome ^_^