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Math Help - Trig identities

  1. #1
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    Trig identities

    Hello

    can someone please verify this answer for me?

    (1+cotA) / (cscA)

    (1+cosA/sinA) / 1 * (sinA/1)/1

    answer is CosA
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  2. #2
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    e^(i*pi)'s Avatar
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    Quote Originally Posted by l flipboi l View Post
    Hello

    can someone please verify this answer for me?

    (1+cotA) / (cscA)

    (1+cosA/sinA) / 1 * (sinA/1)/1

    answer is CosA
    I don't follow what you did with the denominator? If you recall the way of dividing fractions we treat it as multiplying

    \left(1+\frac{cosA}{sinA}\right) \times sinA

    \left(\frac{sinA+cosA}{sinA}\right) \times sinA = sinA + cosA


    edit: the answer cannot be cosA because the identity doesn't hold for A = \frac{\pi}{2}
    Last edited by e^(i*pi); October 29th 2009 at 03:40 AM.
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