Sine Addition/Subtraction Rule

[Nazariy]

Can someone please point to the error ? ...

 

[Deleted member 4993]

Can someone please point to the error ? ...

View attachment 5131

In the second line you write → Let B = B - π/2 ... Then you are assuming π/2 = 0 ...!!!

 

[Nazariy]

1. In the second line you write → Let B = B - π/2 ... Then you are assuming π/2 = 0 ...!!!

I wrote theta there initially. let b = theta - pi/2. Given that, where is the error then?

 

[Deleted member 4993]

I wrote theta there initially. let b = theta - pi/2. Given that, where is the error then?

There is no "b" and no "Θ" in your "derivation. You need to correct the "derivation" - before that, no body will "waste" their time.

 

[Nazariy]

There is no "b" and no "Θ" in your "derivation. You need to correct the "derivation" - before that, no body will "waste" their time.

 

[Steven G]

View attachment 5137

Your very 1st equation is not valid (look it up) and the third line from the very end is not a valid equation.