Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °
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Topic review (newest first)
Yeah it looks just like what I got, and much more accurate. I never liked drawing elipses. For the second problem I finnaly figured out how to keep it clean, just use the half angle formulas for the cos and sin values.
Is this works? (plot is streched a little, but the numbers are correct)
Here's your ellipse(the first problem):
Well done. Only for graphics.
Well I figured out that one, id show what I came up with but I dont have the slightest clue how to show a graph like that on the computer.
Ok I figured it out. Just had to plug the a b and c values into the Cot2θ = ( a - c ) / b. Solving for that im getting θ as 30°. Then I plug it into x = x'cos 30 - y' sin 30 and y = x' sin 30 + y' cos 30.
No the whole problem wasnt that but thats the only part I was stuck on, I know the angle of rotation is 45°. Its just a bad example. The roatation of an ellipse shows it better.
Can be 180 deg.
You have to give the full problem. I'm sure the question isn't just, "Find the angle of rotation in xy - 1 = 0."
I can't understand, too:
What angle of rotation?
I dont think im really understanding this topic. For the problem xy - 1 = 0, how do you get the angle of the rotation out of that?