Other
Answermath.com: Coseno
An online cosine game which offers practice in mental math and times practice. When you submit the wrong answer, it provides the correct one. In Spanish, with links to English and Italian versions.
Ministerio de Educacion, Cultura y Deporte (Spain)
Cnice: Relacion De Ejercicios Interactivos.
In Spanish. Interactive activities online on various geometric and trigonometric concepts such as area, perimeter, secants, tangents, etc. A terrific resource for students. Site is organized acoording to shape. (triangle, quadrilaterals,...
Other
Answermath: Seno
An online sine game which offers practice in mental math and times practice. When you submit the wrong answer, it provides the correct one. In Spanish, with links to English and Italian versions.
Other
Answermath: Tangente
An online tangent game which offers practice in mental math and times practice. When you submit the wrong answer, it provides the correct one. In Spanish, with links to English and Italian versions.
Math2
Tablas Matematicas De David
Presented in Spanish, this site provides math tables and formulas from addition to calculus. Also links to a Spanish-English dictionary of mathematical terms.
Wikimedia
Wikipedia: Trigonometria
In Spanish. An overview of trigonometry, trigonometric functions, and hyperbolic functions. A great resource page.
Ministerio de Educacion, Cultura y Deporte (Spain)
Pagina De Educacion Matematica
In Spanish. A variety of multiple choice probability questions varying in difficulty. Also includes problems on statistics and trigonometry. a great preparation site for post secondary classes. Solutions are not provided.