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Math Help - Trig Equation & Expression

  1. #1
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    Trig Equation & Expression

    hi guys im having a bit of trouble with this 2 questions from my text book.

    1. Find the exact value of the expression:

    cos(arctan3/4)+tan(arccos3/5)

    2. Solve the trig Eq:

    2cos^3(x)+5cos^2(x)=2-cos(x)

    can you guy please post a worked solution if you can im out of ideas.

    thanks
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  2. #2
    Member Goku's Avatar
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    Re: Trig Equation & Expression

    For the first 1 draw the triangle(to understand) and then use your calculator

    and for the second
    2cos^3(x)+5cos^2(x)=2-cos(x)

    --> 2cos^3(x)+5cos^2(x)+cos(x)-2=0

    factorize and then solve for x...
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  3. #3
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    Re: Trig Equation & Expression

    Going to need more help then that
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  4. #4
    Member Goku's Avatar
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    Re: Trig Equation & Expression

    Show me what you have tried to do or what you don't understand and then we can take it from there....
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