Trigonometry: Solve equation for I have the following trigonometric equation: 2 sin( alpha - 45) sin(2 alpha) = sin( alpha + 45) sin( alpha) Is it possible to find alpha

Demarion Ortega

Demarion Ortega

Answered question

2022-11-15

Trigonometry: Solve equation for α
I have the following trigonometric equation:
2 sin ( α 45 ) sin ( 2 α ) = sin ( α + 45 ) sin ( α )
Is it possible to find α?
Please also include each step in your solution.
EDIT: Sorry if I haven't mentioned- yes, it is a solution I reached to as a part of an assignment I was given (school). All I wish to know if I can pull α from what I found.
Thanks in advance.

Answer & Explanation

partatjar6t9

partatjar6t9

Beginner2022-11-16Added 8 answers

The formulas you need to use:
sin ( x y ) = sin x cos y cos x sin y
sin 2 x = 2 sin x cos x
sin ( x + y ) = sin x cos y + cos x sin y
2 sin ( α 45 ) sin ( 2 α ) = sin ( α + 45 ) sin ( α )
( 2 ( sin α cos 45 cos α sin 45 ) ) ( 2 sin α cos α ) = ( sin α cos 45 + cos α sin 45 ) sin α
Here you can cancel out sin α from both sides of the equation but you'll need to point out we assumed sin α 0
4 sin α cos α ( sin α cos 45 ) ) = ( sin α cos 45 + cos α sin 45 ) sin α
4 ( sin α cos α ) ( cos α ) = ( sin α + cos α )
2 cos 2 α 2 sin 2 α + cos α + cos α + 2 = 0

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