Which is your favorite trigonometric function? I like Sine more cause since the derivative of Sinx is just Cosx, instead of that annoying minus sign that you get when you make derivate on Cosx and get -Sinx. In addition, Cos is not a very nice word in Arabic.
EDIT: And don't forget that Tanx=Sinx/Cosx. Sin on top. Cos on bottom.
And that's the end of that story.
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