SOLUTION: if x =arctan(-1) = -pi/4 what is x = arctan (4) = ??? radians what is arctan (4) in radians?

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Question 681172: if x =arctan(-1) = -pi/4
what is x = arctan (4) = ??? radians
what is arctan (4) in radians?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
if x =arctan(-1) = -pi/4
Note: x must be in the 4th Quadrant
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what is x = arctan (4) = ??? radians
x is the angle whose tangent is 4:
tan^-1(4) = 75.96 degrees or 255.96 degrees
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what is arctan (4) in radians?
x = (75.96)(pi/180) = 0.4220pi
or
x = (255.96)(pi/180) = 1.4220pi
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Cheers,
Stan H.