@gilbert189 | wasteof.money 4

my little brother has discovered the rule of cosines by himself

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now i have no excuse to be absolutely clueless about trigonometry

wtf how

like the sine rule, that one’s easy, a over sin A is equal to b over sin B, etc

but the cosine rule, while it makes sense, is a lot more complicated than just 3 fractions equaling

cosine rule: cosine(x) = sine(x + 90°), probably

that’s not the one i was thinking of