Posted by Anonymous on Sunday, January 3, 2010 at 1:39pm.
How do you know when to add k(2pi) or k(pi)? What's the difference?
Also, for this problem, why are you supposed to use k(2pi/5) for the solutions, assuming that there is no domain?
2sin^2(5x)+sin(5x)1=0
Thank you!

Trigonometry  Reiny, Sunday, January 3, 2010 at 1:56pm
You must be referring to post..
http://www.jiskha.com/display.cgi?id=1262496706
Please give yourself a "nickname" other than "anonymous", it makes it easier to find you for subsequent replies.
for any sin(kx) or cos(kx) the period is 2pi/k or 360º/k
your equation contains sin(5x) and cos(5x), so they both have a period of 2pi/5 radians.
that is why I added k(2pi/5) to each answer.
BTW, for tan(kx) the period is pi/k or 180/kº

Trigonometry  Anonymous, Sunday, January 3, 2010 at 3:26pm
Thank you! I will remember to use a nickname in the future. What would the periods be for csc, sec, and cot if I had to solve for those?
Answer This Question
Related Questions
 Math  Can I please get some help on these questions: 1. How many solutions does...
 calc  i did this problem and it isn't working out, so i think i'm either making...
 Calculus help??  I'm not sure how to solve this and help would be great! d/dx [...
 trig  I need to find all solutions of the given equations for the indicated ...
 Mathtrigonometry  Several questions from my homework, any are appreciated. ...
 Trigonometry  Use De Moivre's Theorem to write the complex number in ...
 Precal  How do you find all the polar coordinates of P=(1, 2pi/3)? I've read ...
 trig  1. 3cot^2 (x)  1 = 0 My answer: pi/3, 2pi/3, 4pi/3, 5pi/3 2. 4cos^2 (x...
 Calculus  I need to find the exact solutions on the interval [0,2pi) for: 2sin^...
 math  Find all solutions to the equation tan(t)=1/tan (t) in the interval 0<...
More Related Questions