![f1 = f \sqrt{3 \: } \: \: f2 = f \: \: \: \cos(60) \: \: \: find \: r \: \: f1 = f \sqrt{3 \: } \: \: f2 = f \: \: \: \cos(60) \: \: \: find \: r \: \:](https://tex.z-dn.net/?f=f1+%3D+f+%5Csqrt%7B3+%5C%3A+%7D++%5C%3A++%5C%3A++f2+%3D+f+%5C%3A++%5C%3A++%5C%3A++%5Ccos%2860%29++%5C%3A++%5C%3A++%5C%3A+find+%5C%3A+r+%5C%3A++%5C%3A++)
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r=/r34 is the answer but u see
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