std.math module

[greatsam4sure via Digitalmars-d-learn]

On Monday, 7 August 2017 at 04:47:56 UTC, Nicholas Wilson wrote:
> On Sunday, 6 August 2017 at 23:33:26 UTC, greatsam4sure wrote:
>> import std.math;
>> import std.stdio;
>>
>> cos(90*PI/180) = -2.7e-20 instead of zero. I will appreciate 
>> any help. thanks in advance.
>>
>> tan(90*PI/180) = -3.689e+19 instead of infinity. What is the 
>> best way to use this module
>
> in addition to what sarn said, tan(3pi/4) is a pole, not 
> infinity. the mean of the left and right hand limits is 0

Thanks for the help. I will appreciate any resources for further 
reading