Cosine is just a change in the argument of sine, and vice versa.
sin(x+π/2)=cos(x)
cos(x−π/2)=sin(x)
So why do we have both of them? Do they both exist simply for convenience in defining the other trig functions?
How to find limh→0sin(ha)h without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...
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