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Thread: trig help

  1. #1
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    trig help

    1. Prove sin(sin^2(x))/(1- cos(x))= 1
    2. Solve 2 tan(x)+ (√12) = 0
    3. 2cos(^2x) + cos(x)= 1 Write the general solutions.
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  2. #2
    Senior Member vincisonfire's Avatar
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    1. If the first identity is really $\displaystyle \frac{sin(sin^2(x))}{1-cos(x)}$ then I think that the statement is false. Take e.g. x=pi/4.
    2. $\displaystyle tan(x) = -\frac{\sqrt{12}}{2} $*use the operator arctan [/tex]*tan^{-1} [/tex]*
    3. This is a quadratic equation. Let $\displaystyle *cos(x) = y $*then the equation becomes $\displaystyle 2y^2+y-1=0 $.*
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  3. #3
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    Quote Originally Posted by vincisonfire View Post
    1. If the first identity is really $\displaystyle \frac{sin(sin^2(x))}{1-cos(x)}$ then I think that the statement is false. Take e.g. x=pi/4.
    2. $\displaystyle tan(x) = -\frac{\sqrt{12}}{2} $*use the operator arctan [/tex]*tan^{-1} [/tex]*
    3. This is a quadratic equation. Let $\displaystyle *cos(x) = y $*then the equation becomes $\displaystyle 2y^2+y-1=0 $.*
    thanks for your help
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