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Description
The C library function double atan(double x) returns the arc tangent of x in radians.
Declaration
Following is the declaration for atan() function.
Parameters
- x − This is the floating point value.
Return Value
This function returns the principal arc tangent of x, in the interval [-pi/2,+pi/2] radians.
Example
The following example shows the usage of atan() function.
Let us compile and run the above program that will produce the following result −
math_h.htm
Hi everyone,
I am taking a C++ 100 level beginners course and we just got this assgnment that I am stuck on. Here is the assginment description:
Dev C++ Online
We are going to just compute the first 15 or so digits of π using doubles.
In any case, to compute the value of π, we need a formula for it. Let’s use the standard formula,
π = 16arctan(1/5) - 4arctan(1/239)
Arctan Divided By Arctan
This is all well and good, but in order to compute π, we need to compute arctan now. We could try to use a standard function from cmath, but let’s write our own function to compute arctan. Mathematicians tell us an easy formula to use is
arctan(x) = x - x^3/3 + x^5/5 - x^7/7 + x^9/9 - ..
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The only parts that might need some thinking are the alternating signs, and the fact that the exponents and denominators both increment by 2.
Here is a sample output from the program:
Pi = 3.14159265358
Press any key to continue
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In class, the professor told us to compare it to the programs we worked on to compute sin(x) and e^x. I have been referring to those programs I have but I still can't seem to solve it. Here is what I have so far:
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Arctan Dev C Calculator
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- commentLatest Postby WaltPLatest Post
WaltP2,905
1) Why calculate the denom and power values from scratch each time? Just add 2 each time through the loop.
Arctan Is The Same As
2) How does
sign*power/denom;
equate to x^5/5
? Where's your x? Where's x^5?