Math 6A, Section 1 - Swarthmore College

c. Solve Y’=AY using the substitution Y = QZ. 2. Practice with the identity cos ( x + y ) = cos x cos y – sin x sin y. Let ( be a fixed, non-zero constant. Show that the family of functions. f(t) = c1 cos ((t) + c2 sin ((t) is the same as the family of functions. g(t) = A cos ( (( t - ( ) ). ................
................