# A logarithmic cotangent inequality – mathoverflow.net

 Traut 25/12/2015 9:47 am HOME » 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 ...

 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 ... TAGS: logarithmic cotangent inequality mathoverflow 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 TAGS: Learn Inequality Sign Reversed when Both 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 TAGS: Calculate Cotangent Stable Cotangent by Twista in Development Is there a more stable implementation for the cotangent function than return 1.0/tan(x);? TAGS: Stable Cotangent 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) - TAGS: inverse hyperbolic cotangent ``` 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 TAGS: Graph Tangent Cotangent Functions 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 TAGS: Calculate Cosecant Secant Cotangent 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 TAGS: Find Cotangent Graphing Calculator 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 TAGS: Graph Cosecant Secant Cotangent 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 TAGS: Find Sine Cosine Tangent Cotangent