solve using identities for all

Use the identities cos^2 x + sin^2 x =1and cos2x=cos^2 x -sin^2 x to show that cos^4 x -sin^4 x = cos2x Im not sure how, I can
1. 1 answer
2. asked by Anon
3. 616 views
This question has me stuck. Use the Pythagorean identity sin^2 Θ + cos^2 Θ = 1 to derive the other Pythagorean identities, 1 +
1. 1 answer
2. asked by Iris
3. 1,188 views
when we think about our multiple identities , most of us will find that we both dominant and targeted at the same time. But it
1. 1 answer
2. 101 views
When we think about our multiple identities, most of us will find that we are both dominant and targeted at the same time. But
1. 1 answer
2. asked by Sisipho
3. 104 views
Select all the true statements about identities.A) You may use proven identities to prove other identities. B) An identity is
1. 0 answers
2. asked by TeeKay
3. 792 views
Trigonometry identities are so hard...I need some help proving these identities: *Oh, and I'm only in grade 11, so the
1. 5 answers
2. asked by Lucy
3. 809 views
Verify/Solve the identities.1.) SIN^1/2 X COS X-SIN^5/2 X COS X 2.) Long problem, but it's fun to solve! SEC^6 X(SEC X TAN
1. 0 answers
2. asked by AwesomeGuy
3. 589 views
Are any of these three problems identities?1. Cos^2x-sin^2x=1-2sin^2x 2. Sinxsecx=cosxcscx 3. Sec^4x-tan^4/sec^2x=1+sin^2x If
1. 2 answers
2. asked by Melody
3. 832 views
Are any of these three problems identities?1. Cos^2x-sin^2x=1-2sin^2x 2. Sinxsecx=cosxcscx 3. Sec^4x-tan^4/sec^2x=1+sin^2x If
1. 1 answer
2. asked by Melody
3. 1,123 views
{1/(sec x - 1)} - {1/(sec x +1)} = 2 cot^2 xsolve using identities?
1. 5 answers
2. asked by Britt
3. 744 views