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Spectrum Group Title

which of the following are identities? a. sin8x = 2sin4x cos4x b.(sinx-cosx) ^2 = 1 + sin2x c. (1-tan^2x)/2tanx = 1/ tan2x d. (sinx +sin5x)/ (cosx+ cos5x) = tan3x

  • one year ago
  • one year ago

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  1. baldymcgee6 Group Title
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    just put in a value for x and see if it is true.

    • one year ago
  2. Spectrum Group Title
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    i can't do c

    • one year ago
  3. Spectrum Group Title
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    whenever i try to input values it never works

    • one year ago
  4. omnomsBESTfriend Group Title
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    .

    • one year ago
  5. Spectrum Group Title
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    that was helpful

    • one year ago
  6. .UserNotFound. Group Title
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    XD

    • one year ago
  7. Spectrum Group Title
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    can you please help me ?

    • one year ago
  8. vivifang Group Title
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    The answer can't B (sinx - cosx)^2 = (sinx)^2 - 2sinxcosx + (cosx)^2 (sinx)^2 + (cosx)^2 = 1; 2sinxcosx = sin2x therefore, (sinx - cosx)^2 = 1- sin2x

    • one year ago
  9. vivifang Group Title
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    Answer is A http://www.wolframalpha.com/input/?i=+sin8x+%3D+2sin4x+cos4x

    • one year ago
  10. Spectrum Group Title
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    a ..... not b ..okay what about c and D?

    • one year ago
  11. RadEn Group Title
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    c. correct to

    • one year ago
  12. RadEn Group Title
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    d. correct

    • one year ago
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