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Thread: Trigonometric Equation

  1. January 21st 2009, 04:49 PM #1
    cdx
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    Trigonometric Equation

    2cotx+sec^2x=0

    xe[0,2\pi]
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  2. January 21st 2009, 06:53 PM #2
    mathaddict
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    Re :

    Quote Originally Posted by cdx View Post
    2cotx+sec^2x=0

    xe[0,2\pi]

    \frac{2}{tanx}+(1+tan^2x)=0 , multiply the whole thing by tan x

    tan^3x+tanx+2=0

    Let tan x = y

    y^3+y+2=0 ... Can u continue from here ?
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  3. January 21st 2009, 07:09 PM #3
    cdx
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    Thanks, I forgot about the identity

    <br /> sec^2x = 1 + tan^2x<br />
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