Prove: 2cos^2(x)-1 = 1-tan^2(x)/ 1+tan^2(x)

prove that tan(pi/4 + 1/2cos-1a/b) + tan(π/4-1/2cos-1a/b)=2b/a
1. 2 answers
2. asked by Satyam Singh
3. 1,185 views
cosA= 5/9 find cos1/2Aare you familiar with the half-angle formulas? the one I would use here is cos A = 2cos^2 (1/2)A - 1 5/9 +
1. 0 answers
2. asked by Anonymous
3. 828 views
Prove:2cos^2(x)-1 = 1-tan^2(x)/ 1+tan^2(x) Thank you!
1. 5 answers
2. asked by Beatriz
3. 556 views
Prove:cos4x = 8cos^4x - 8cos^2x + 1 My Attempt: RS: = 4cos^2x (2cos^2x - 1) + 1 = 4 cos^2x (cos2x) + 1 LS: = cos2(2x) =
1. 38 answers
2. asked by Anonymous
3. 2,767 views
Prove sin(4x)= (4sinxcosx)(2cos(x)^(2)-1
1. 1 answer
2. asked by Kyler
3. 1,103 views
How would you prove this identity?(sin^3(x)+cos^3(x))÷(1-2cos^2(x)) = (sec(x)-sin(x))÷(tan(x)-1)
1. 1 answer
2. asked by Anna
3. 470 views
prove that sin(n+1)A-sin(n-1)A/cos(n+1)A+2cos(nA)+cos(n-1)A=tanA/2
1. 0 answers
2. asked by ankita
3. 421 views
Verify this identity. How would you prove it(sin^3(x)+cos^3(x))÷(1-2cos^2(x)) = (sec(x)-sin(x))÷(tan(x)-1)
1. 1 answer
2. asked by Beatrice
3. 552 views
prove that : cos^3(θ)sin^2(θ)=1/16[2cos(θ)-3cos(θ)-5cos(θ)]
1. 1 answer
2. asked by Rabin
3. 489 views
prove that sin^6a+sin^4acos ^2a-sin^ 2acos^4a=1-2cos^2a
1. 1 answer
2. asked by Abdullah
3. 479 views