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Originally Posted by ROTARYROCKET7' date='Jun 23 2003, 08:00 AM
AN interger is non negative because it lies in the set of real numbers. If you go into negative numbers with intergers you are now entering the set of imaginary numbers. Those problems are brain teasers and the way to solve it by trial and error using odd and even numbers. I just failed my math test for Differential Equations.
SOlve this problem: x^2 means x squared okay.. y' means first derivative.. '' means second and so on e= eulers equation = 2.7 ln= natural log cos t^2 + sin t^2 =1 ( identity) cot = cotangent sec= secant IIGht Find a Particular Solution for y'' + 4y= 3 csc t ( csc is the cosecant so its 1/sin (t) ) SO the general solution is yc(t) = C1 cos 2t + C2 sin2t The general solution is off this form because the discriminat b2-4ac ( part of the quadratic equation of the form -b +- (b2-4ac)^(1/2) / 2(a) ). is less than 0. so then the general equation is y= e ^ lambda (t) ( c1 cos u(t) + c2 sin u(t) ) and the discrimant therfore gives us lambda = 0 so e raised to the zero is 1 and then we get C1 cos 2t + C2 sin2t. Find the coefficiants c1 and c2 byusing variation of parameters where the first condition that needs to be satisfied is 1) v1'y1 + v2'y2= 0 2) v1'y1' + v2'y2' = csc (t) by using trigonometric substituition. Engineers of NP.com gimme this answer! The answer is y= 3 sint + 3/2 ln | csc t - cot t|sin2t + c1 cos2t + c2 sin2t The only reason I would find that intresting, is if it made my 7 go faster. I supose, were all different https://www.nopistons.com/forums/pub...IR#>/smile.png |
i feel like locking this thread, math = the not gooder
mike |
Originally Posted by ROTARYROCKET7' date='Jun 23 2003, 08:00 AM
AN interger is non negative because it lies in the set of real numbers. If you go into negative numbers with intergers you are now entering the set of imaginary numbers. Those problems are brain teasers and the way to solve it by trial and error using odd and even numbers. I just failed my math test for Differential Equations.
SOlve this problem: x^2 means x squared okay.. y' means first derivative.. '' means second and so on e= eulers equation = 2.7 ln= natural log cos t^2 + sin t^2 =1 ( identity) cot = cotangent sec= secant IIGht Find a Particular Solution for y'' + 4y= 3 csc t ( csc is the cosecant so its 1/sin (t) ) SO the general solution is yc(t) = C1 cos 2t + C2 sin2t The general solution is off this form because the discriminat b2-4ac ( part of the quadratic equation of the form -b +- (b2-4ac)^(1/2) / 2(a) ). is less than 0. so then the general equation is y= e ^ lambda (t) ( c1 cos u(t) + c2 sin u(t) ) and the discrimant therfore gives us lambda = 0 so e raised to the zero is 1 and then we get C1 cos 2t + C2 sin2t. Find the coefficiants c1 and c2 byusing variation of parameters where the first condition that needs to be satisfied is 1) v1'y1 + v2'y2= 0 2) v1'y1' + v2'y2' = csc (t) by using trigonometric substituition. Engineers of NP.com gimme this answer! The answer is y= 3 sint + 3/2 ln | csc t - cot t|sin2t + c1 cos2t + c2 sin2t |
Originally Posted by djgiantrobot' date='Jun 23 2003, 12:21 PM
[quote name='ROTARYROCKET7' date='Jun 23 2003, 08:00 AM'] AN interger is non negative because it lies in the set of real numbers. If you go into negative numbers with intergers you are now entering the set of imaginary numbers. Those problems are brain teasers and the way to solve it by trial and error using odd and even numbers. I just failed my math test for Differential Equations.
SOlve this problem: x^2 means x squared okay.. y' means first derivative.. '' means second and so on e= eulers equation = 2.7 ln= natural log cos t^2 + sin t^2 =1 ( identity) cot = cotangent sec= secant IIGht Find a Particular Solution for y'' + 4y= 3 csc t ( csc is the cosecant so its 1/sin (t) ) SO the general solution is yc(t) = C1 cos 2t + C2 sin2t The general solution is off this form because the discriminat b2-4ac ( part of the quadratic equation of the form -b +- (b2-4ac)^(1/2) / 2(a) ). is less than 0. so then the general equation is y= e ^ lambda (t) ( c1 cos u(t) + c2 sin u(t) ) and the discrimant therfore gives us lambda = 0 so e raised to the zero is 1 and then we get C1 cos 2t + C2 sin2t. Find the coefficiants c1 and c2 byusing variation of parameters where the first condition that needs to be satisfied is 1) v1'y1 + v2'y2= 0 2) v1'y1' + v2'y2' = csc (t) by using trigonometric substituition. Engineers of NP.com gimme this answer! The answer is y= 3 sint + 3/2 ln | csc t - cot t|sin2t + c1 cos2t + c2 sin2t School ended like a week or two ago or soemthing, i couldnt tell you a damn thing about algebra now.. https://www.nopistons.com/forums/pub...1047683329.gif |
Originally Posted by djgiantrobot' date='Jun 23 2003, 08:21 AM
About a year ago i would have actually tried to help you with that, you'd be shocked how quick you'll loose all that once you are out of school. oh yeah, someone hire me.
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I believe the answer is -3, -1, and 1. Thanks!
(someone else also came up with this answer, so 2 alike answers are good enough for me!) |
The orginal problem is impossible to solve with only WHOLE numbers. Integers include all REAL numbers, Their NEGATIVES, and zeros.
Oh and RotaryRocket7 is wrong about Imaginary numbers. Those are the Square root of Negative numbers. All this **** was on my Nuke exam for the NAVY. Apperently they want people to know math while working on Nuclear reactors. Go figure https://www.nopistons.com/forums/pub...1047683561.gif |
Originally Posted by Joe Flo' date='Jun 23 2003, 01:32 PM
The orginal problem is impossible to solve with only WHOLE numbers. Integers include all REAL numbers, Their NEGATIVES, and zeros.
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Originally Posted by Baldy' date='Jun 23 2003, 09:37 AM
[quote name='Joe Flo' date='Jun 23 2003, 01:32 PM'] The orginal problem is impossible to solve with only WHOLE numbers. Integers include all REAL numbers, Their NEGATIVES, and zeros.
Yes but you know what I mean.... I forgot what all positive numbers where called. I left my brain in High School |
I say school has been out way to long to be doin god damn math. Hell there is only like 3 fields where you will ever use that ****. I stay stick with car math
Me + RX-7 = https://www.nopistons.com/forums/pub...#>/biggrin.png https://www.nopistons.com/forums/pub...1047683473.gif https://www.nopistons.com/forums/pub...1047683329.gif |
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