Video duration: 136 seconds
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This video demonstrates how multitouch technology works, demonstrating zoom in and out and scrolling using multitouch on different applications including a user's inbox, the Internet, pictures, and rotating images such as Google Earth. More info on www.n-trig.com
Video duration: 605 seconds
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Solving trigonometric equations. This is the opening of lesson thirty three from "AS" and "A" Level Mathematics DVD video PART FOUR available from www.mathstutor.biz
Video duration: 591 seconds
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Rational trigonometry can be used to solve surveying problems, usually more simply than the current way. This video gives three examples: finding the height of a mountain, Regiomontanus' problem, and spreads over a right triangle.