What is the general solution, in degrees, to the equation 2cosxcos 2x – 2 sin x sin 2.x =-1? A. 40° +180'n; 80° +180°n; neI C. 40° +120°n; 80° +120'n; nel B. 40' +120°n; nel D. 220' +120'n; 330° +120°n; nel
What is the general solution, in degrees, to the equation 2cosxcos 2x – 2 sin x sin 2.x =-1? A. 40° +180'n; 80° +180°n; neI C. 40° +120°n; 80° +120'n; nel B. 40' +120°n; nel D. 220' +120'n; 330° +120°n; nel
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:What is the general solution, in degrees, to the equation 2cosxcos 2x – 2 sin x sin 2.x=-1?
A. 40° +180°n; 80° +180°n; nɛ1
C. 40° +120°n; 80° +120°n; nɛl
B. 40° +120°n; nɛl
D. 220° +120°n; 330° +120°n; n e l
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