First off, you must have a calculator to find any cos,sin, or tan.
tangent of 39 degrees is .80978
rounding to the nearest ten thousandth would be .8098 because the 8 in the hundred thousandths is greater than 5.
X = 3
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Answer:
0.5² + (3/5)²=0.5²+0.6²=0.25+0.36=0.71
