Question

Will medal and fan!! Just check my work?

Verify the identity.

cos 4x + cos 2x = 2 - 2 sin^2 2x - 2 sin^2 x

Answer 1

@hartnn @ParthKohli Please help!! I really need it

Answer 2

@poopsiedoodle Please could you just check my work?

Answer 3

cos 4x +cos 2x = 2 cos ^2 2x -1 + 2 cos^2 x -1
= 2(1 - sin^2 2x ) -1 +cos 2x
=1-2sin^2 2x + 1-2sin^2 x
=2 - 2sin^2 2x - 2 sin^2 x

Answer 4

@raffle_snaffle

Answer 5

Nicely done!

Answer 6

Let me check one more time.

Answer 7

are you sure its right because Im really not definite?

Answer 8

Yes, you are very much correct!

Answer 9

great he helped you

Answer 10

=)

Answer 11

That's offensive @raffle_snaffle

Answer 12

i guess it came out wrong. lol I am glad you helped him

Answer 13

okay so I shouldn't include anything else in my response to be more thorough? @eggs&bacon

Answer 14

her*

Answer 15

Nope, I think it reads pretty well.

Answer 16

lol sorry her...

Answer 17

@raffle_snaffle Lol, why I said I'm offended is because I'm a girl! Lol

Answer 18

oh lol sorry

Answer 19

@gorv

Answer 20

@dsneider2016 How'd you know I was a girl?

Answer 21

Oh wait, you're a girl. Nevermind.

Answer 22

I know, I know. Lol. Did I help?

Answer 23

yes your method is correct bud

Answer 24

Oh thank you!

Answer 25

so you as well wouldnt add anything?

Answer 26

nope

Answer 27

you did it in right way

Answer 28

ok Thank you!

Answer 29

Wait, why he get medal and me don't?