A trig exact ratio memory trick.

This trig memory trick from TheXSquaredFactor is really good.

It is for 'remembering' the sine and cosine of angles that most students are told to memorize. 

So that is 0,30,45,60 and 90 degrees.

I think a lot of students would make good use of this nifty 'trick'.

Thanks XSquaredFactor :)

https://web2.0calc.com/questions/sine-cosine-and-tangent_2#r7