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My co-milkshake brings the yard to all the boys

Mrs L-P just asked for an explanation of this joke, and is now asking if cosine is the category-theoretic dual of sine.

@christianp @acciomath They're duals in the non-category-theoretic sense f(x) ↔ f(π/2 − x), same as tangent ↔ cotangent, and secant ↔ cosecant.

@christianp @acciomath Wait how did those totally normal Unicode arrows turn into big blocky emoji ones

@acciomath @christianp *shrug* Some platform-dependent funkiness going on then

@christianp @acciomath if you consider complex numbers? (do not take me seriously, I know nothing about this 😅)

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