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You can use the arctangent or the reverse tangent to solve for x, which is denoted by arctan or tan^-1.
If tan [x] = 3, then arctan [3] = x. This applies to all trigonometric functions (ex. if sin [x] = 94, then arcsin [94] = x.
Punch that into your calculator and the answer will be:
arctan [3.0] = 71.565 (degrees)
arctan [3.0] = 1.249 (radians)
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