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What are some applications of elementary linear algebra outside of math?
It's not just important for 3D graphics. It is also important for 2D graphics. It could probably be applied to any xD graphics, but 2D and 3D are the ones most likely encountered.
How to evaluate trigonometric functions by pen and paper?
The part "For example around 1400 Islamic mathematicians" should include commas like "For example, around 1400, Islamic mathematicians" to clarify the meaning. Otherwise, it sounds like you're talking about 1400 mathematicians.