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Prove sin(4x)= (4sinxcosx)(2cos(x)^(2)-1

  1. Prove sin(4x)= (4sinxcosx)(2cos(x)^(2)-1
    1. answers icon 1 answer
    2. Kyler asked by Kyler
    3. views icon 1,115 views
  2. how can you confirm the identitycos^4x = (1/8)(3+ 4cos2x+ cos4x) and sin4x = (4sinxcosx)(2cos^2x-1)
    1. answers icon 2 answers
    2. Sarah Kim asked by Sarah Kim
    3. views icon 960 views
  3. Prove the identity and give its domain.4sinxcosx+sin4x=8sinxcos^3x
    1. answers icon 1 answer
    2. Courtney asked by Courtney
    3. views icon 915 views
  4. prove that tan(pi/4 + 1/2cos-1a/b) + tan(π/4-1/2cos-1a/b)=2b/a
    1. answers icon 2 answers
    2. Satyam Singh asked by Satyam Singh
    3. views icon 1,193 views
  5. 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. answers icon 0 answers
    2. Anonymous asked by Anonymous
    3. views icon 841 views
  6. Prove:2cos^2(x)-1 = 1-tan^2(x)/ 1+tan^2(x) Thank you!
    1. answers icon 5 answers
    2. Beatriz asked by Beatriz
    3. views icon 561 views
  7. 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. answers icon 38 answers
    2. Anonymous asked by Anonymous
    3. views icon 2,789 views
  8. How would you prove this identity?(sin^3(x)+cos^3(x))÷(1-2cos^2(x)) = (sec(x)-sin(x))÷(tan(x)-1)
    1. answers icon 1 answer
    2. Anna asked by Anna
    3. views icon 482 views
  9. prove that sin(n+1)A-sin(n-1)A/cos(n+1)A+2cos(nA)+cos(n-1)A=tanA/2
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    2. ankita asked by ankita
    3. views icon 433 views
  10. 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. answers icon 1 answer
    2. Beatrice asked by Beatrice
    3. views icon 567 views