Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
Promoted
20/3.14) sin(2t)+(40\(3.14^2)cos(2t) = 7.5cos(2t-22) can someone please explain how?
Update:
The point of the excersise is to use the 7.5 cos(2t-122) to solve an eleectrical engineering problem. but my trig is rusty. Any help is appreciated.
1 Answer
Relevance
- alexLv 72 years ago
4.06 cos(2t)+6.37 sin(2t) = √(4.06^2+6.37^2)[cos(2t) cos(a)+sin(2t)sin(a)] , with a = tan^-1(6.37/4.06) = 1 rad
= 7.55 cos(2t - 1)
Still have questions? Get your answers by asking now.