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yesterday comment added gidds “Like myself, they do not rely on their memory when doing math at all, only for me it was a conscious choice” — you sound like me at the start of my A-levels (that's age 16, doing further maths before uni)… That lasted until I did surprisingly badly in the end-of-term tests.  Not only was there not enough time to derive the double-angle formulæ &c when needed; but you also needed to recognise all the formulæ when they turned up.  And that needs memory.  — After I bit the bullet and spent ages memorising all the relevant formulæ, I did a lot better.
2 days ago history edited fedja CC BY-SA 4.0
improved wording in a couple of places
Jan 29 at 3:49 history edited fedja CC BY-SA 4.0
corrected a few typos
Jan 29 at 3:19 history edited fedja CC BY-SA 4.0
added 18 characters in body
Jan 29 at 2:33 history answered fedja CC BY-SA 4.0