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5 September, 20:07

If sin theta=21/29

, what is cos theta

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Answers (2)
  1. 5 September, 20:11
    0
    20/29 is the cosine of theta
  2. 5 September, 20:29
    0
    To find cosine, you can use one of the formulas in the Pythagorean Identity, which is Sin^2 + Cos^2 = 1. Using this information, we can plug in sin into this equation.

    So, (21/29) ^2 + cos^2 = 1

    (21/29) ^2 = 441/841.

    Bring this over to the other side by subtracting it by both sides, so

    cos^2 = 1 - 441/841.

    To subtract, convert the one to have the same denominator and then subtract, so

    cos^2 = 841/841 - 441/841 = cos^2 = 400/841 (square root this)

    cos = 20/29 that is your final answer.
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