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Math Help - Trigonometric expression help...

  1. #1
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    Trigonometric expression help...

    Here's the problem ... I am not getting the right concept to apply here. I have tried to replace 5cos^2 theta with (1 - sin^2 theta) but I cannot reach a conclusion at all.

    I have to find the roots in the interval 0 <= theta <= 360 correct to 1 decimal place.

    10sin^2 \theta - 5cos^2 \theta + 2 = 4sin \theta

    P.S. I am not sure how to add degree subscript character in latex on this forum.
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  2. #2
    Super Member flyingsquirrel's Avatar
    Joined
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    Hi,
    Quote Originally Posted by struck View Post
    Here's the problem ... I am not getting the right concept to apply here. I have tried to replace 5cos^2 theta with (1 - sin^2 theta) but I cannot reach a conclusion at all.
    Once you've replaced \cos^2\theta by 1-\sin^2\theta, substitute X=\sin \theta and solve the equation for X (it's a quadratic).
    P.S. I am not sure how to add degree subscript character in latex on this forum.
    [tex]360^{\circ}[/tex] gives 360^{\circ}.
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