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Fun fact: " Some people have curly black hair through proper brushing" now using the initials you can make out that this is used to learn trignometric formulas in a fun way. So, S for Sin theta is P/H(people/Have) Cos theta is B/H (Black/Hair) and Tan theta is P/B (Proper/brushing).... This way you can come up with some tricks of learning formulae.