The case of the disappearing angle units, or "the dangle of the angle"
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08-02-2019, 01:31 PM
Post: #4
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RE: The case of the disappearing angle units, or "the dangle of the angle"
On my XCas setup, I keep the default to RAD, and scale with deg = pi/180 if needed.
Switching back and forth between angle units is not worth the trouble. Worse, sometimes it return wrong result. Example: XCas> deg := pi/180 XCas(RAD)> float(integrate(x+sin(x*deg), x = 30 .. 45)) // got back 571.605366361 XCas (DEG)> float(integrate(x+sin(x), x = 30 .. 45)) // OK, same as above XCas(RAD)> float(integrate(x*sin(x*deg), x = 30 .. 45)) // got back 345.33893383 XCas (DEG)> float(integrate(x*sin(x), x = 30 .. 45)) // BAD ! Error while checking exact value with approximate value, returning both! [-5.63193625867, 345.33893383] |
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