Sometimes mathematicians forget basic stuff...

trigonometric identities and formulas
Please notify me if there are mistakes, TQ. Click to enlarge.
I admit, as shameful as it may sound, i do forget even the simplest of fact, formulas and theorems most of the times. Therefore, i think it's best to make myself an online reminder/reference, just so i can refer to it in the future *y'know, incase books get replaced with iPads :p*
P/s to self: eat more raisin, taugeh and fish to improve memory!

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twatter, i'll follow u later =)