Find the integral surface of (x-y)(p-q) = z(q+1) which contains the circle z=4; x2+y2=42.
x sin y - y cos x = c
d^2y/dx^2+dy/dx-y=6
Which of the following functions are solutions of the differential equation y”– 4y’+4y = e
x?
(a) e^x
(b) e^2x
(c) e^2x + e^x
(d) xe^2x + e^x
(e) e^2x + xe^x