cos0=3/5
sinθ = opposite/hypotenuse = 3/5 so you are missing the adjacent, commonly referred to the x x^2 + 3^2 = 5^2 x^2 = 25-9 = 16 x = √16 = 4 Notice you have the most basic Pythagorean triangle with sides 3, 4, and 5 then cosθ = adjacent/hypotenuse = 4/5
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