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Math Help - 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 0\leq x \leq 360^o

    2sin^2x-3cosx=0

    and

    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 0\leq x \leq 360^o

    2sin^2x-3cosx=0

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

    and

    2cosx+3tanx=0

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