Definition of the math word face Definition of "Factor" Number Prime number - math word definition Definition of "Factor" Foci Ellipse - math word definition- Math Open Reference Foci of an ellipse Foci of an ellipse Elliptical mirrors Ellipse - math word definition- Math Open Reference Finding the foci an ellipse Parabola definition (focus / directrix form) Focus Area of a triangle given three sides - Heron's Formula with calculator Reciprocal - math word definition Number Fraction Full Angle - An angle with a measure of 360 deg Full angle - Math word definition Trigonometry function with large and negative angles SOHCAHTOA - math word definition - Trigonometry The sine function - math word definition The trigonometry arcsin() function - inverse sine - math word definition The trigonometry arccos() function - inverse cosine - math word definition Introduction to the 6 trigonometry functions Graph of the Sine function - Trigonometry Secant function (sec) - Trigonometry The tangent function in right triangles - Trigonometry The inverse trigonometry functions Graph of the Tangent function - Trigonometry The trigonometry arctan() function - inverse tangent - math word definition Graph of the Cosine function - Trigonometry Calculus - Derivative Function Function Functions as used in programming languages Calculus - Invertible Functions Cosine - math word definition Cubic curve and graph display Graph of a function Graphical Function Explorer grapher (GFE) Domain Linear function graphical explorer (mx+b) Linear function graphical explorer (ax+b) Calculus - Functions defined using integrals Calculus - Fundamental Theorem of Calculus