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Thread: Need some help and explanation...

  1. #1
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    Need some help and explanation...

    ok, i gotta solve these equations and my answers have to be $\displaystyle 0\leq x \leq 360^o$

    $\displaystyle 2sin^2x-3cosx=0$

    and

    $\displaystyle 2cosx+3tanx=0$

    I don't know how to solve these equations...
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  2. #2
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    Quote Originally Posted by crosser43 View Post
    ok, i gotta solve these equations and my answers have to be $\displaystyle 0\leq x \leq 360^o$

    $\displaystyle 2sin^2x-3cosx=0$

    change $\displaystyle \textcolor{red}{sin^2{x}}$ to $\displaystyle \textcolor{red}{1 - cos^2{x}}$ and solve the resulting quadratic

    and

    $\displaystyle 2cosx+3tanx=0$

    multiply every term by $\displaystyle \textcolor{red}{\cos{x}}$ , then change $\displaystyle \textcolor{red}{\cos^2{x}}$ to $\displaystyle \textcolor{red}{1 - \sin^2{x}}$ ... same drill, solve the resulting quadratic.
    ...
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