TAG: memory

The right order for the fundamental trig identity

If you google “fundamental trig identity” you will get many many images and handouts which all list the fundamental trig identity as:
sin2 t + cos2 t = 1
This is, of course in the wrong orderĀ and it should really have cos firstĀ then sin, like this:
(cos t)2 + (sin t)2 = 1
“But David,” you say, “it’s addition, […]

Posted in How people learn (or don't), Thoughts about maths thinking | Tagged , |

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