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Spectrum

  • 3 years ago

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

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  1. baldymcgee6
    • 3 years ago
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    just put in a value for x and see if it is true.

  2. Spectrum
    • 3 years ago
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    i can't do c

  3. Spectrum
    • 3 years ago
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    whenever i try to input values it never works

  4. omnomsBESTfriend
    • 3 years ago
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    .

  5. Spectrum
    • 3 years ago
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    that was helpful

  6. .UserNotFound.
    • 3 years ago
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    XD

  7. Spectrum
    • 3 years ago
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    can you please help me ?

  8. vivifang
    • 3 years ago
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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

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

  10. Spectrum
    • 3 years ago
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    a ..... not b ..okay what about c and D?

  11. RadEn
    • 3 years ago
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    c. correct to

  12. RadEn
    • 3 years ago
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    d. correct

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