Posted by Greg on Wednesday, November 14, 2012 at 3:12pm.
What value(s) of theta solve the following equation? cos^2(theta)cos(theta)6=0?
I try plugging in different numbers but I am not sure exactly what I am looking for in order to solve?

Trigonometry  Reiny, Wednesday, November 14, 2012 at 3:50pm
cos^2 Ø  cosØ  6 = 0
let cosØ = x , then we get
x^2  x  6 = 0
(x3)(x+2) = 0
x = 3 or x = 2
then cosØ = 3 or cosØ = 2
both of these are not possible, since the cosine is defined only between 1 and +1
there is no solution to your equation

Trigonometry  Steve, Wednesday, November 14, 2012 at 4:43pm
also, you coul dhave reasoned thus:
cos^2θ <= 1
1 <= cosθ <= 1
no way could you have cos^2θ  cosθ = 6
Answer This Question
Related Questions
 Precalculus 2  Similiarly to a question I asked previously I took the same ...
 Trigonometry  Okay, I have been given a trigonometric equation to solve (sin^2(...
 Calculus  I wanted to confirm that I solved these problems correctly (we had to...
 Trigonometry  Prove the following identities: 1. (tan theta  sin theta)^2 + (1...
 Trigonometry  Prove the following identities: 1. (tan theta  sin theta)^2 + (1...
 Mathamatics  Solve the following trigonometry identities. a) 1cos2(theta) = ...
 Math  Trigonometry  Let f(x) be a polynomial such that f(cos theta) = cos(4 ...
 Trigonometry  Thank you STEVE!!!!! Suppose that Cos (theta) = 1/square root 2 ...
 science  Sitting on a horizontal track is a mass of 10kg. One end of the track ...
 Trigonometry  Use a sum of difference identity to write the expression as a ...
More Related Questions