  • Matrices
• Algebra
• Geometry
• Funciones
• Trigonometry
• Coordinate geometry
• Combinatorics
 Suma y resta Producto por escalar Producto Inversa
 Monomials Polynomials Special products Equations Quadratic equations Radical expressions Systems of equations Sequences and series Inner product Exponential equations Matrices Determinants Inverse of a matrix Logarithmic equations Systems of 3 variables equations
 2-D Shapes Areas Pythagorean Theorem Distances
 Graphs Definition of slope Positive or negative slope Determine slope of a line Ecuación de una recta Equation of a line (from graph) Quadratic function Posición relativa de dos rectas Asymptotes Limits Distancias Continuity and discontinuities
 Sine Cosine Tangent Cosecant Secant Cotangent Trigonometric identities Law of cosines Law of sines
 Ecuación de una recta Posición relativa de dos rectas Distancias Angles in space Inner product

Trigonometry
The reciprocal trigonometric ratios: cotangent

It is said that there are six ratios possible for the lengths of the sides of a right triangle. You have learned about the sine (sin), cosine (cos), and tangent (tan) ratios. The three other trigonometric ratios are their reciprocals.

Cotangent (cot): is the reciprocal of tan, i.e. the ratio of the length of the adjacent side to the length of the opposite side.

 cot θ = _1_ tanθ = adj opp Important note:There is a big difference between cot θ and tan-1x. The first one means "1/tan θ". The second one involves finding an angle whose tangent is x. So on your calculator, don't use your tan-1 button to find cot θ.

Look at the following right triangle, where:
a = 4
b = 6
Find the cotangent of angle A

The cotangent of angle A is =
(round the solution to hundredths)