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∫1/(x²+1)dx
arctan(x)+C
∫1/(x²-1)^.5dx
arcsin(x)+C
∫1/(x²+1)^.5dx
arccos(x)+C
Equation for Heat Loss
T’=k(T-TA)
Spring Equation
mx’’+cx’+kx=F(t)
critically damped
c²-4mk=0 1 root with multiplicity 2
overdamped
c²-4mk>0 (2 real roots and has no oscilitation)
underdamped
c²-4mk<0 (imaginary roots and has oscilation)
Amplitude
C=(A²+B²)^.5
Phase Shift
B/A=tan(gamma)
Angular Frequency
w=(k/m)^.5
Solution for spring problems
x=Acos(wt)+Bsin(xt)=Ccos(wt-gamma)
Circuits Solution
LI’’+RI’+I/C=E’(t)