Question

hey can someone explain to me how to do trigonometric identities

Answer 1

http://www.purplemath.com/modules/idents.htm

Answer 2

those just show the identities i need a actual step by step learning process

Answer 3

Can you provide an example? We cannot teach you a whole lesson plan over just a few minutes online. There is too much information to really try and condense it down to a few sentences.

bUT @Jesstho.-. is right, you should learn the identities first. They are the key to solving them and manipulating proofs.

Answer 4

yeah, I'll get one from my worksheet give me a min

Answer 5

You have to take your time also :P

Answer 6

i know i just have a hard time remembering the identities which is why i probably don't understand it lol

Answer 7

ok heres an example 1+cos^4 x-sin^4=2cos^2x

Answer 8

how would you prove that identity

Answer 9

MEDALS WILL BE GIVEN!!! Use the net to find the surface area of the cylinder.
R=5yd H=7yd

Answer 10

@kingswank
You are asking a question in another persons question.

Answer 11

I'm sorry dang

Answer 12

The magic trig identity:

\[\cos^{2}(x)+ \sin^{2}(x) =1\]

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

work with the left side
1+(cos^2x+sin^2x)(cos^2x-sin^2x) difference of 2 squares

(cos^2x+sin^2x) remember this =1 so

1 + 1(cos^2x-sin^2x) or just
(cos^2x-sin^2x)

now

1+(cos^2x+sin^2x) again the magic identity

(cos^2x+sin^2x)+(cos^2x+sin^2x) sin;s cancel

cos^2x+cos^2x=2cos^2x

solved

Answer 13

@zpupster
Cool.

Answer 14

thanks @zpupster

Answer 15

http://www.purplemath.com/modules/idents.htm