For general w with w 0 find the general solution of the ODES a) y" | w²y — b) y" + w² y = cos(x) (assume that w₤1). c) y" w²y = cos(wx)

The range of y = cscx and y = sec x is: 0(-∞0, –1] U [1, ) O yɛ R ye R; y does not equal + 1 O(-00, -1) U (1, o0)

2. If f(x, y, z)=exp(3x)cos(-4yz), find Vf.

What is the solution of the DE tan? x csc³ y dx = dy? cos³y A. tan x – x = cos y+ + c B. tan x = – cos y + cos³y + c cos3y + c C. x = - cos y + cos³y + c 3 D. tan x – x = - cos y + Answer: What is the order of y" + y" + y' + y = 0 A. Order 1 B. Order 2 C. Order 3 D. none Answer: