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A comment on Obsolete trig functions and why we don't use them anymore (2013). Parent comment

Re:Obsolete trig functions and why we don't use them anymore... by filmor on Thursday December 03, 2020 @08:57AM (#25288835)
No, you can't. You can come to the conclusion that if there exits an x with sin(x) = 0, then cos(x) = 1. The expression as it stands is true for every x \in R without any additional assumptions.
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Re:Obsolete trig functions and why we don't use them anymore... by amelius on Thursday December 03, 2020 @09:37AM (#25289203)
Yes, I agree that was badly worded, but in any case you need more than those two equations to do anything meaningful with sin(x) and cos(x).
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Re:Obsolete trig functions and why we don't use them anymore... by laszlokorte on Thursday December 03, 2020 @10:32AM (#25289783)
but you could conclude that cos and sin are both jsut the constant function: x->sqrt(0.5)
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Re:Obsolete trig functions and why we don't use them anymore... by filmor on Saturday December 05, 2020 @01:07PM (#25316736)
Not at all, same reason.
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