There is no simple way. You could use published tables but I don't suppose that is what you meant.
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Usually there is an inverse key or( tan -1 )key for this
To find the angle ( a ) for which ( \tan a = 0.42 ), you can use the inverse tangent function (also known as arctangent). This can be calculated using a calculator or software that provides trigonometric functions. The result will give you ( a ) in radians or degrees, depending on your calculator's settings. Specifically, ( a \approx 22.62^\circ ) or ( a \approx 0.394 ) radians.
since x is negative you use the identity cot-1(x)=tan-1(1/x)+pi. Tan-1(1/-sqrt3) + pi 5pi/6 + pi =pi
You cannot because you do not know what R is.
that queation doesnt make any sence u retard because u cant get the tan of a triangle u can only get the tan of a number To find the tan of an angle you want to use this ratio: Opposite side divided by adjacent side Once you find the answer, on a scientific calculator you enter in your answer and hit the inv button then the tan button and it should give you your answer.