My Math Forum  

Go Back   My Math Forum > High School Math Forum > Trigonometry

Trigonometry Trigonometry Math Forum

LinkBack Thread Tools Display Modes
July 21st, 2013, 12:14 PM   #1
Joined: Jul 2013

Posts: 5
Thanks: 0

Trigonometry Homework problem.

So I started my homework, and I would like opinions if I did it right.

Solve the following trigonometric equation finding all solutions for x in the interval [0, 2pi]


So I moved the 2cos(2x) to the other side,

So then I simplify;


Then I solved for the Os

cos2x=0 csc^2(x)=0

cos in 0 will be pi/2 , 3pi/2

csc= +-1 (then I convert to the reciprocal sin=+- 1) then pi/2, 3pi/2

So my answers will be


k=2=9pi/4 (this out of range)

Please guys or gals check my problem and tell me if I did it right!
TrimHonduras is offline  
July 21st, 2013, 06:40 PM   #2
Global Moderator
Joined: Dec 2006

Posts: 18,965
Thanks: 1606

You made a reasonable start, but then didn't post all the steps of your work, so I don't know precisely how you made certain errors. There are six solutions in the specified interval, but ? is not a solution.
skipjack is offline  

  My Math Forum > High School Math Forum > Trigonometry

homework, problem, trigonometry

Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
problem with trigonometry Fiendchanter Trigonometry 7 December 11th, 2013 04:11 PM
Trigonometry Problem Twisted Trigonometry 7 April 29th, 2013 03:42 AM
Trigonometry Problem Please Twisted Trigonometry 2 April 28th, 2013 03:00 PM
Trigonometry problem! u53rn4m3 Trigonometry 4 September 1st, 2011 01:24 PM
gcd homework problem Jamers328 Number Theory 3 September 27th, 2007 08:00 AM

Copyright © 2018 My Math Forum. All rights reserved.