What is sin (x + (pi/4)) when sin x = 1/2?

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    Trigonometry
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Discussion Overview

The discussion revolves around determining the value of sin(x + (π/4)) given that sin(x) = 1/2, with x constrained between 0 and π/2. The focus is on trigonometric properties and methods of solving the problem without the use of calculators or logarithmic tables.

Discussion Character

  • Homework-related
  • Mathematical reasoning

Main Points Raised

  • One participant suggests starting by identifying all values of x that satisfy sin(x) = 1/2 within the specified range, noting that there is only one such value.
  • Another participant mentions the requirement to avoid calculators or logarithmic tables, implying a need for manual calculation methods.
  • A different participant presumes that knowledge of special right triangles and angles is necessary to approach the problem, referencing a 3-4-5 triangle as an example.
  • One participant expresses uncertainty about the problem, questioning whether knowledge of triangle properties is essential and indicating a struggle with how to proceed from a drawn triangle.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best approach to solve the problem, with some focusing on the properties of triangles while others express uncertainty about the requirements.

Contextual Notes

The discussion highlights the limitations of relying on specific trigonometric properties and the need for clarity on the problem's requirements, particularly regarding the use of tools for calculation.

Joza
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Simple trigonometry...

Just some simple Trigonometry...

If sin x = 1/2, then what is sin (x + (pi/4)), if x is greater than or equal to 0 and less or equal to pi over 2?

Method?
 
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Start by figuring out all the values of x that satisfy sin x = 1/2 (between 0 and pi/2). (There's only one.)
 
It specifies do not use calculator or log tables...
 
I presume you are expected to know the properties of some special right triangles and special angles? (For example: a 3-4-5 right triangle)

You need some facts at your disposal to get started.
 
I'm not sure. I haven't seen a question like this one before. So basically I have to know the properties of the triangle? I can draw one with the sin = 1-2 to part...but where from there?
 

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