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anonymous

  • 5 years ago

given that cos theta=4/5find sin theta

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  1. dumbcow
    • 5 years ago
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    use trig identity sin^2+cos^2 =1 sin^2 = 1-cos^2 ....... since cos = 4/5 cos^2 = 16/25 1-cos^2 = 1-16/25 = 9/25 ......... sin^2 = 9/25 sin = 3/5

  2. anonymous
    • 5 years ago
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    Or you could use a right triangle. Knowing cosine = adj/hyp, you could use pythagorean theorem (a^2 + b^2 = c^2) to find the missing side of the triangle (which would be 3). Then since, sine = opposite/hyp, you would get 3/5

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