Isolating a variable in an equation

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In summary, the equation given is (k1)(L^2)sin(theta)cos(theta)+(k2)(L^2)sin(theta)-(k1)(L^2)sin(theta)cos(theta)-.5(m)(g)(L)cos(theta) = 0 and the task is to find theta in terms of k1,k2,L,m,g. The conversation reveals that the first and third terms cancel out and the correct version of the equation is (k2)(L^2)sin(theta)cos(theta)+(k1)(L^2)sin(theta)-(k1)(L^2)sin(theta)cos(theta)-.5(m)(g)(L)cos(theta) = 0. The person asking
  • #1
tanderse
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Homework Statement



given the equation:

(k1)(L^2)sin(theta)cos(theta)+(k2)(L^2)sin(theta)-(k1)(L^2)sin(theta)cos(theta)-.5(m)(g)(L)cos(theta) = 0

find theta in terms of k1,k2,L,m,g

I've been messing around with trig identities all day. I would really appreciate some help.
 
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  • #2
At the risk of pointing out the obvious, don't the first and third terms cancel?
 
  • #3
my bad, I had 2 typos in the equation. my notes has become such a mess, I can't even keep things straight on this problem anymore. here's the correct version:

(k2)(L^2)sin(theta)cos(theta)+(k1)(L^2)sin(theta)-(k1)(L^2)sin(theta)cos(theta)-.5(m)(g)(L)cos(theta) = 0

find theta in terms of k1,k2,L,m,g
 

FAQ: Isolating a variable in an equation

How do I isolate a variable in an equation?

Isolating a variable in an equation involves rearranging the terms of the equation to have the variable on one side of the equals sign and all other terms on the other side. This can be done by using inverse operations, such as addition, subtraction, multiplication, and division, to cancel out any constants or coefficients that are attached to the variable.

Why is it important to isolate a variable in an equation?

Isolating a variable allows us to find the specific value of that variable, rather than just solving for an entire expression. It also makes it easier to manipulate and solve more complex equations.

What are some common mistakes to avoid when isolating a variable?

One common mistake is forgetting to perform the same operation on both sides of the equation. It's important to keep the equation balanced by performing the same inverse operation on both sides. Another mistake is not properly distributing a coefficient when it is attached to a set of parentheses.

Can we isolate any variable in an equation?

In most cases, yes, we can isolate any variable in an equation. However, there may be some cases where it is not possible due to mathematical restrictions, such as dividing by zero. Additionally, some equations may have multiple variables and may require additional information to isolate a specific variable.

Is isolating a variable the same as solving an equation?

Isolating a variable is one step in solving an equation. Solving an equation involves isolating the variable and then finding the specific value of that variable. In some cases, an equation may require multiple steps of isolating a variable before it can be solved completely.

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