Related to : A logarithmic cotangent inequality – mathoverflow.net

A logarithmic cotangent inequality – mathoverflow.net 
25/12/2015 9:47 am by Traut in Development 

I must be a terrible googling searcher but I cannot find a reference
to the following inequality:
$$ forall_{phiin(0;frac pi 4)} ln(cot(phi))), <, cot(2!cdot!phi) $$
I have just ...

How to Learn why the Inequality Sign is Reversed when Both Sides of an Inequality Problem is Multiplied by a Negative Number 
by Monev in Development 

Many students in solving Inequality Problems, wonder why the
Inequality Sign is Reversed when Both Sides of the Inequality is
Multiplied or Divided by a Negative Number. This Article will show the
reason the INEQUALITY SIGN is Reversed or changes to the opposite
direction.Difficulty:EasyInstructions

How to Calculate Cotangent 
by aafr in Development 

Cotangent is one of the basic functions of trigonometry. (Some of the
others are sine, cosine, secant, cosecant and tangent.) The cotangent
is defined as the ratio of the length of the adjacent leg of the
triangle to the length of the opposite
leg.Difficulty:ModerateInstructions Things You'll Nee

Stable Cotangent 
by Twista in Development 

Is there a more stable implementation for the cotangent function
than return 1.0/tan(x);?

inverse hyperbolic cotangent 
by Blunc in Development 

I think the inverse hyperbolic cotangent is the same as 1/(atanh)
however math.h doesnt have acoth however my problem is this: c
code produces #QNAN0 from this:
Code: xx = (exp(a_global*2*pi) 

How to Graph Tangent & Cotangent Functions 
by Barry in Development 

The tangent is a trigonometric function defined as the sine divided by
the cosine. Another way of defining it is the tangent of an angle is
the ratio of the side opposite the angle divided by the side adjacent
to the angle in a right triangle. For example, in a triangle with
sides of 3, 4 and 5 inc

How to Calculate Cosecant, Secant & Cotangent 
by boomhower in Development 

The cosecant, secant and cotangent are all reciprocal trigonometric
functions. They are calculated in similar ways to the conventional
functions sine, cosine and tangent to solve for unknown angles.
Although a basic problem, solving for values in right triangles
represents the core of trigonometry

How to Find the Cotangent on a Graphing Calculator 
by UglyCasanova in Development 

In trigonometry, the cotangent is the reciprocal of the tangent. The
formula for determining the tangent is the opposite side divided by
the adjacent side of a triangle. So, since the cotangent is the
reciprocal, then the formula for determining the cotangent is the
adjacent side divided by the oppo

How to Graph Cosecant, Secant & Cotangent 
by skulldrinker in Development 

The two basic trigonometry functions are the sine and cosine
functions. The sine function is the "y" coordinate of an angle on a
unit circle, and the cosine function is its "x" coordinate. The other
four trigonometry functions can be derived from these two functions.
Cosecant is the multiplicative i

How to Find Sine, Cosine, Tangent and Cotangent 
by sarah in Development 

Sine, tangent, cotangent and cosine are all functions when dealing
with right triangles. Sine, tangent and cosine are the primary
functions of trigonometry. When you see these functions in
trigonometry problems, these functions are written as sin, tan and
cos. Although graphing calculators can fi
