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Khan Academy
Khan Academy: Add & Subtract Matrices
Find the matrix that is the result of the addition or subtraction of two given matrices.
Wolfram Research
Wolfram Math World: Trigonometric Addition Formulas
This tutorial offers formulas and explanations on trigonometric addition formulas and features an easy way to remember the sine and cosine addition formulas using matrices.
Math Notes and Math Tests
Pre Calculus Notes: Operations With Matrices [Pdf]
Students explore operations with matrices. Topics examined are matrix addition, scalar multiplication, matrix multiplication, and identity matrices. Class notes and examples are included.
Math Medics
S.o.s. Math: Introduction and Basic Operations
This tutorial gives students an introduction to matrix addition with definitions and examples.
CK-12 Foundation
Ck 12: Determinants
[Free Registration/Login may be required to access all resource tools.] Understand that the zero and identity matrices play a role in matrix addition and multiplication similar to the role of 0 and 1 in the real numbers. The determinant...
Other
Ggmap: Spatial Visualization With Ggplot2 [Pdf]
In spatial statistics the ability to visualize data and models super imposed with their basic social landmarks and geographic context is invaluable. ggmap is a new tool which enables such visualization by combining the spatial...
Other
Stat Soft: Statistics Glossary
Dozens of statistical terms are defined and illustrated in this glossary.