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What is tan1x ?

Answer
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Hint: Sometimes tan1x or arctanx is also written in the form tan1x . So, tan1x is the compositional inverse of the trigonometric function tangent and it gives an answer in the form of an angle. It is basically used to find an angle from the trigonometric ratios.
Formula used: The formulas used are:
If
  y=tanxx=tan1y
 tan1x±tan1y=tan1(x±y1±xy)
Derivative of tan1x :
 11+x2x+1,1

Complete step by step solution:
tan1x is another form of the inverse of tangent function. It is also written in the form tan1x or arctanx . Now let us see some of its properties.
Addition of two tangent inverse functions:
If x and y are two angles, then,
 tan1x±tan1y=tan1(x±y1±xy)
Derivative of tan1x :
 11+x2x+1,1
 tan1x can also be obtained by integrating the derivative within the limits 0 to x .
The graph of inverse tangent function:
seo images

Other inverse tangent properties:
Domain of the ratio is all real numbers
Range of value in radians is π2<x<π2
Range of value in degrees is 90 <x<90
The tangent inverse of infinity is:
 tanπ2=tan1=π2


Note: If we want to calculate an angle in a right angled triangle, then the inverse tangent function can be used for this. i.e. in a right angled triangle ABC
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Angle, θ can be calculated as:
 θ=tan1(ABBC)
Where, AB is on the opposite side and BC is on the adjacent side.
It is to be noted that tan1x should not be confused with (tanx)1 because tan1x is the inverse of the tangent function while (tanx)1 is the cotangent i.e.
 (tanx)1=1tanx=cotx
As the tan inverse or tan1x gives the value in the form of an angle, so, the numbers between which the value of tan1x lies i.e. the range of tan1x is also calculated in degrees or radians.
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