Prove the identity: cos^4(x)-sin^4(x)=1-2sin^2(x).with explanation

Prove the identity: cos^4(x)-sin^4(x)=1-2sin^2(x).with explanationim confused on this one cause of the 4th power of the sine.
1. 1 answer
2. asked by Anonymous
3. 698 views
prove the following identitycos^4X - sin^4X = 1-2sin^2X
1. 2 answers
2. asked by Breanna
3. 527 views
pls. help:prove the identity sin2x+sin2y=2sin(x+y)cos(x-y)
1. 1 answer
2. asked by justme
3. 4,458 views
Prove the following identity:-(i) tan^3x/1+tan^2x + cot^3x/1+cot^2 = 1-2sin^x cos^x/sinx cosx
1. 1 answer
2. asked by MATHS
3. 609 views
Prove the identity. (must work with left side)(1-2sin(x)^2)=(cos(x)^2)
1. 1 answer
2. asked by mailon
3. 493 views
Prove that each equation is an identity.I tried to do the problems, but I am stuck. 1. cos^4 t-sin^4 t=1-2sin^2 t 2. 1/cos s=
1. 1 answer
2. asked by Anonymous
3. 748 views
Prove each identity:a) 1-cos^2x=tan^2xcos^2x b) cos^2x + 2sin^2x-1 = sin^2x I also tried a question on my own: tan^2x = (1 –
1. 1 answer
2. asked by Kate
3. 700 views
I don't understand,please be clear!Prove that each equation is an identity. I tried to do the problems, but I am stuck. 1. cos^4
1. 0 answers
2. asked by Anonymous
3. 672 views
Prove:sin2x / 1 - cos2x = cotx My Attempt: LS: = 2sinxcosx / - 1 - (1 - 2sin^2x) = 2sinxcosx / - 1 + 2sin^2x = cosx / sinx - 1 =
1. 5 answers
2. asked by Anonymous
3. 1,479 views
Prove that:sin(x+2y)+sin(y+2z)+sin(z+2x)=4sin(x-y)/2sin(y-z)/2sin(z-x)2
1. 1 answer
2. asked by Rabin
3. 468 views