How to solve this trig equation

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Homework Help Overview

The problem involves solving a trigonometric equation for θ, specifically 2sinθcosθ + 1 - 2sin²θ = 0. The discussion centers around the use of trigonometric identities and simplification techniques.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss factoring and simplifying the equation, with some expressing uncertainty about how to proceed with different identities present. Questions about relevant trigonometric identities are raised, particularly concerning the terms 2sinθcosθ and 1 - 2sin²θ.

Discussion Status

Some participants have suggested using identities to rewrite the equation in a more manageable form. There is an ongoing exploration of how to express all terms in a consistent manner, with no clear consensus yet on the next steps.

Contextual Notes

Participants note the challenge of working with multiple identities and the need for clarification on the correct interpretation of terms within the equation.

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Homework Statement



Solve for θ.
2sinθcosθ + 1 - 2sin^2θ = 0

Homework Equations





The Attempt at a Solution


I tried factoring, but I don't know how to continue with 2 diff ID's in one equation.
I don't know how to simplify it so that everything is in terms of one similar Identity.
:\
 
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Do you know any identities for 2sinθcosθ and 1 - 2sin2θ?
 
My mistake. You meant to show sin2(theta), and I misread this.
 
okay, I used 2sinxcos x and changed it to sin 2x so that I get:
-2sin^2(x) + sin2x + 1 = 0
How could I continue since I put everything in terms of sin?
 
Last edited:
Find an identity for 1 - 2sin2x and use that.
 

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