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Math Help - Preparing for next year 3

  1. #1
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    Preparing for next year 3

    Hi,

    I've asked for a list of questions from a teacher to do over the holidays. I'm struggling to use the text book to help me.

    Could someone provide HOW to do these questions, as I just want to get an idea of what I'm getting next year.

    Thanks.

    5. Find the exact solutions of sin(4x) = cos(2x), for 0<=x<=pi

    6. Given that tan(2x) = (4sqrt(2))/7 where x is an element of [0,pi/4) find the exact value of sinx
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  2. #2
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    Quote Originally Posted by jonoe View Post
    Hi,

    I've asked for a list of questions from a teacher to do over the holidays. I'm struggling to use the text book to help me.

    Could someone provide HOW to do these questions, as I just want to get an idea of what I'm getting next year.

    Thanks.

    5. Find the exact solutions of sin(4x) = cos(2x), for 0<=x<=pi

    6. Given that tan(2x) = (4sqrt(2))/7 where x is an element of [0,pi/4) find the exact value of sinx
    5. Substitute sin(4x) = 2 sin(2x) cos(2x), re-arrange, factorise, use the null factor law and get two simple trig equations to solve.

    6. Get tan(x) using double angle formula. Use the value of tan(x) to get value of sin(x).

    Please refer to my comments made in another of your threads.
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