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Math Help - trigonometry: simplifying

  1. #1
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    Red face trigonometry: simplifying

    cos^2C-sin^2C/cosC - sinC

    C is an angle

    thanks so much
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  2. #2
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    Quote Originally Posted by fotzefotze View Post
    cos^2C-sin^2C/cosC - sinC

    C is an angle

    thanks so much
    Hey fotzefotze,

    If it looks like this: \frac{cos^2C-sin^2C}{(cosC - sinC)}

    Then: \frac{(cosC+sinC)(cosC-sinC)}{(cosC - sinC)} = (cosC+sinC)

    Hope i've been helpful

    tsal15
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  3. #3
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    that was very helpful.
    Could you please explain why that last step simplifies that way? thanks.
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  4. #4
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    Quote Originally Posted by fotzefotze View Post
    that was very helpful.
    Could you please explain why that last step simplifies that way? thanks.
    I'm canceling the particular numerator with the denominator.

    I'll give u a similar example,

    \frac{x^2 -9}{x-3} = \frac{(x-3)(x+3)}{(x-3)} = (x+3) lets say x = 4 and substitute it in the original equation to check, \frac{((4)^2-9)}{((4)-3)} = 7 and now sub it into (x+3) = 7

    let me know if u need more help...
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  5. #5
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    Alright. I completely get it now. thanks
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  6. #6
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    welcome
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