Which of the following is not true? (a) 5 cos 3x is a solution to (x)

Which of the following is not true?
(a) –5 cos 3x is a solution to Φ" (x) + 9 Φ(x) = 0
(b) 10 sin 2x is a solution to Φ" (x) – 4 Φ(x) = 0
(c) –4 cosh 3y is a solution to R" (y) – 9R(y) = 0
(d) sinh 2y is a solution to R" (y) –  4R(y) = 0

(e)

Transcribed Image Text:

g" (x) g(x) h" (y) h(y) = f(z) = -1 where g(x) = sin x and h(y) = sinh y