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Prove That Cos3A = 4Cos

  1. Prove That Cos3A = 4Cos A - 3Cos A
    1. answers icon 1 answer
    2. Gabriel Gad asked by Gabriel Gad
    3. views icon 670 views
  2. IF A+B+C=Π prove that sin(3A)+sin(3B)+sin(3C)=-4cos(3A÷2)cos(3B÷2)cos(3C÷2)
    1. answers icon 1 answer
    2. Mujyambere asked by Mujyambere
    3. views icon 885 views
  3. 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 2,744 views
  4. Prove 8sin^5x=sinx(3-4cos(2x)+cos(4x))
    1. answers icon 2 answers
    2. Larry Wheels asked by Larry Wheels
    3. views icon 335 views
  5. Prove that (3-4sin^2A) (1-3Tan^2A)= (3-tan^2A) (4cos^2A-3)
    1. answers icon 8 answers
    2. Alina maharjan asked by Alina maharjan
    3. views icon 12,142 views
  6. sin^4 x = (3-4cos 2x + cos4x)/8prove on one side please!
    1. answers icon 4 answers
    2. Rachel asked by Rachel
    3. views icon 2,351 views
  7. Prove that:(3-4sin^2A) (1-3tan^2A)=(3-tan^2A)(4cos^2A-3)
    1. answers icon 1 answer
    2. Rishabh asked by Rishabh
    3. views icon 1,466 views
  8. By expressing 3x as (2x + x) prove thatcos3x = 4cos^3x - 3cosx
    1. answers icon 1 answer
    2. Rin asked by Rin
    3. views icon 1,016 views
  9. By expressing 3x as (2x + x) prove thatcos3x = 4cos^3x - 3cosx
    1. answers icon 1 answer
    2. Rin asked by Rin
    3. views icon 773 views
  10. Prove the identities1. cos3Ɵ + cos Ɵ = 4cos^Ɵ - 2 cos Ɵ 2. sin (A+B)sin (A-B)=cos2B + sin^2 A-1
    1. answers icon 1 answer
    2. Anonymous asked by Anonymous
    3. views icon 557 views