Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
junior college 2 | H2 Maths
No Answers Yet
Help Noel george! Anyone can contribute an answer, even non-tutors.
How dis the sin(nx) and cos(nx) disappear?
Date Posted: 4 years ago
Views: 569
sin n# = 0 for all integer values of n (# is my symbol for pi)
The cos n# I am not sure since it can be 1 or -1 and nothing else seems to suggest that the terms cancel out. What is the original question given leading to that solution?
The author seems to assume that cos n# = 1 in both the times that cos n# appears the solution, even though this is only true if n is an even number.
360 Tutoring Program