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anonymous

  • one year ago

is secxtanx(1-sin^2x)=sinx a trigonometric identity?

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  1. welshfella
    • one year ago
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    Hint: 1 - 2sin^2 x = cos^2 x - also convert secx tanx to sin's and cos's and see what you get

  2. welshfella
    • one year ago
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    1 - sin^2 x = cos ^2 x sec x = 1/ cos x tan x = sin x / cos x replace these in your identity and see what you can simplify - maybe it will simplify to sin x

  3. welshfella
    • one year ago
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    if it does then its a trigonometric identity

  4. anonymous
    • one year ago
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    okay i'll try that thank you

  5. welshfella
    • one year ago
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    yw

  6. anonymous
    • one year ago
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    would the answer be no ?

  7. welshfella
    • one year ago
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    |dw:1433778634726:dw|

  8. welshfella
    • one year ago
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    can you see where we can cancel out some of the functions?

  9. welshfella
    • one year ago
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    I am assuming you know that cos^2 x = cos x * cos x

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