**trigonometry Is the arctan of a negative number always**

If you know how to find the arctan of a "perfect" number, good. Be able to recognize when you have a "perfect" number and when you don't. If you do, give the exact solution.... Use the cosine double angle formula: #cos(2x)=2cos^2(x)-1# Here, inside the cosine function, the angle #arctan(5/12)# is being doubled, so we see that

**Inverse Math Is Fun**

Arctan would result in degrees or radians so your A and B most likely have coordinates like (x, y). Then you do arctan((By - Ay) / (Bx - Ax)) if I remember correctly, here Bx is the x coordinate of B etc.... If you know how to find the arctan of a "perfect" number, good. Be able to recognize when you have a "perfect" number and when you don't. If you do, give the exact solution.

**trigonometry Is the arctan of a negative number always**

How to calculate ArcTan(x) ? I need an algorithm to calculate the inverse tangent (tan ^ -1) for a specific floating-point x (-inf < x < inf). It has to converge fast or at least there must be a mechanism to calculate it to a specific number of digits ?... Pi and the Fibonacci Numbers How Pi is calculated When we find an arctan of a reciprocal of an even-indexed Fibonacci number, we can use (A) to replace it by a sum of two terms,

**How do you find arctan of a number? Yahoo Answers**

There's essentially no way to find an "exact" value of #arctan(1/2)# expressed as a finite expression of integers combined via addition, subtraction, multiplication, division, and root taking.... To calculate the arctangent of a number, just enter the number and apply the arctan function. For example, to calculate the arctangent of the following number 10, type arctan(10) , or directly 10 if the arctan button already appears, the result 1.4711276743 is returned.

## How To Find Arctan Of A Number

### The phase of a complex number Physics Forums

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## How To Find Arctan Of A Number

### 19/02/2012 · in cartesian form, a+ ib you can find the phase by doing arctan(b/a).. my question concerns the phase of a purely imaginary number. during a lecture my professor said that the phase of i*2pi= pi/2, he rationalized this by saying that the number lies on the y-axis so the angle between the real axis

- If you declare 15 as a real number by appending a "." to it, then value gets the intended value. to it, then value gets the intended value. theta ends up with the value: 0.04542327942157701
- How to calculate ArcTan(x) ? I need an algorithm to calculate the inverse tangent (tan ^ -1) for a specific floating-point x (-inf < x < inf). It has to converge fast or at least there must be a mechanism to calculate it to a specific number of digits ?
- A theoretical detail can be found on Wikipedia. “Arctan of x can be defined as the inverse of the tangent function of x where x is a real number (x∈ℝ).”
- The arctan is used to obtain an angle from the tangent trigonometric ratio, which is the ratio between the side opposite to the angle and the adjacent side of the triangle. The function spans all real numbers (-∞ - +∞) and so do the results from our arcsin calculator.

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