11-10-2002, 06:35 AM | #1 |
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Can anyone tell me at what point the line y=cos(x) is zero? The only thing that I've got to calculate it with is a calculator which I suspect isn't being too precise about it's values.
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11-10-2002, 06:41 AM | #2 |
Xanathar Thieves Guild
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y=cos(x) right at this.............................................. .................................................. .................................................. .............................. .................................................. ........................point. How could you not know that? Must be those redneck Denmark schools [img]tongue.gif[/img] Sorry Nob [img]smile.gif[/img]
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11-10-2002, 06:44 AM | #3 |
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90
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11-10-2002, 06:55 AM | #4 |
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Excellent. Thanks for the aid, LS.
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11-10-2002, 10:20 AM | #5 |
Emerald Dragon
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90,270,450,630,810,990 ...... you kinda get the idea ..... [img]smile.gif[/img]
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11-10-2002, 01:14 PM | #6 | |
Harper
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Quote:
Or havent you done radians yet? For what its worth, calculators are precice at the zero points of a trig function. But only then.
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11-10-2002, 05:21 PM | #7 | |
Emerald Dragon
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Quote:
Or havent you done radians yet? For what its worth, calculators are precice at the zero points of a trig function. But only then.[/QUOTE]I've done radians, hmm i wonder why i couldnt give the answer in radians ..... |
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11-10-2002, 09:20 PM | #8 |
Drow Priestess
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whacky and andrewas are completely correct. cos(x) = 0 for x = ((2k + 1)/2) * pi, where k is any integer value and x is a radian measure.
Calculators are funny. You can enter any number for a degree measure and it will give you the cosine of that number; however, if you enter any number in between -1 and 1 you will get the inverse cosine only for degrees between -90 and +90 degrees.
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11-10-2002, 11:16 PM | #9 |
Lord Ao
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the term "any integer" implies this, but remember that k can be negative as well.
e.g. -pi/2, -3pi/2 , ....
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11-11-2002, 02:08 AM | #10 |
Jack Burton
Join Date: November 10, 2001
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If you`re working in degrees, it`s just the sine curve outset by 90. [img]smile.gif[/img]
So for a single revolution, if sin(0)=0, 180, 360 Then, cos(90) = 0, 180, 360 If cos(0)= 90, 270 Then sin (90)= 90, 270 If you know one, you know the other- the sine of an angle is equal to the cosine of a complimentary angle. [img]smile.gif[/img] |
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