Why is (sinA)^2+(cosA)^2=1? Here's the evidence...
In this video I explain why (sinA)^2 + (cosA)^2 = 1. This video can be found on Youtube [https://www.youtube.com/watch?v=7yNsksDbU2k] but I've also uploaded it to this blog.
y=arctanx sketch - Related to C3 Exams...
Learn how to draw the y=arctanx graph by watching the video below. For more videos like these, visit http://www.mathsvideos.net .
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