Anonymous user
Talk:Formal power series: Difference between revisions
→About solving equations
m (→About solving equations: Replaced with math tag.) |
|||
Line 18:
The task seems incomplete without defining cos as:
<math>\cos x = \frac{-d^2}{dx^2} \cos x</math>
assuming that d/d''x'' denotes the differential operator. The task uses the integral operator instead and sin''x'' as a temporal. Shouldn't it work with '''any''' operator defined defined in the task, in any combination of? --[[User:Dmitry-kazakov|Dmitry-kazakov]] 10:32, 17 February 2009 (UTC)
:But also <math>\sin x = \frac{-d^2}{dx^2} \sin x</math>; and in fact any linear combination of sin and cos will satisfy that differential equation you gave. --[[Special:Contributions/76.167.241.45|76.167.241.45]] 06:00, 18 February 2009 (UTC)
| |||