A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 one year ago
*Trigonometric Identities*
anonymous
 one year ago
*Trigonometric Identities*

This Question is Closed

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0cos2 y − sin2 y = 1 − 2sin2 y

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0its cos^2y  sin^2y= 1  2sin^2y

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2try using the identity sin^2 y + cos^2 y = 1

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0isnt it better to change cos so ill have all sin?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2replace cos^2 y by 1  sin^2 y on the left side

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so its (1  sin^2y)  sin^2y = 1 2sin^2y

anonymous
 one year ago
Best ResponseYou've already chosen the best response.01 2sin^2y = 12siny

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2 your last post was incorrect the previous one completed the proof

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0but shouldnt both sides be the same thing?o.O

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2No you have taken the left side and by using known trig identity converted it to the right side

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2 therefore the identity is true

anonymous
 one year ago
Best ResponseYou've already chosen the best response.01  sin^2y)  sin^2y = 1 2sin^2y

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0from here I expanded the brackets and got 1  sin^2y  sin^2y = 1 2sin^2y

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0 sin^2y  sin^2y =  2 sin^2y

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2cos^2y  sin^2y = 1  2sin^2y now cos^2 y = 1  sin^2 y so substituting 1  sin^2 y  sin^2 y = 1  2 sin^2 y = RHS

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2RHS = right hand side

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so then wouldnt it be 1  2sin^2y = 1  2sin^2y??

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2no  no need to write that usually with these , you pick the more complicated side of the identity and try to convert it to the other side . Once that is done you have confirmed the identity.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so wat will the answer be then? o.O

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2just write what i have put or if you like at the end write 'the above proves the original identity'.

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2 thats what this is  a Proof.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so this is the answer? 1  sin^2 y  sin^2 y = 1  2 sin^2 y = RHS

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2No there are 2 lines before that  check 6 posts back.

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2the answer is the whole process of proving the identity

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2cos^2y  sin^2y = 1  2sin^2y now cos^2 y = 1  sin^2 y so substituting 1  sin^2 y  sin^2 y = 1  2 sin^2 y = RHS The above proves the original identity

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2you could also make a note to clarify that RHS = right hand side

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2gotta go  hope this has clarified things
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.