I love Desmos, I love graphing packages. I even like TI-8x graphic calculators (Even the old, old TI-82s with dodgy screen contrast).
But sometimes it needs to be graphed by hand. Sharp pencils. Accurate marks. Slow, deliberate, calculation of points.
Because there’s something about realising that when you plot sin(x) and cos(x) they have the same value at x=45 that comes from actually drawing it. Or that something horrible and frightening and wonderful is happening as you approach tan(90). Or that cosec(x) and sec(x) look totally weird but make sense when you try to make a table of values and compare to sin(x) and cos(x).
Because in the end, if you haven’t drawn it accurately and had your hand try to make the shape, what hope do you have of sketching or visualising?
Because in the end, ‘I drew it on my graphic calculator’ won’t earn you marks.
Maybe it’s blasphemy. But tomorrow we will sharpen our pencils, fire up our scientific calculators and draw some goddamn trig functions. And, since I’m in a bit of a mood and I haven’t finished my tea, I’ll fight anyone who tells me I’m wrong.
Enjoy the smell of pencil shavings.