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Genral solutions for trig watch

1. The general solution for both (primary values,secondary values) of sintheta
is given by : .PV=primary value
Although I can see why this is true from a cast diagram .does anyone know how to prove this?

Thanks
2. help...
3. What have you done in the hour since posting this to try and resolve this issue?
4. (Original post by rbnphlp)
The general solution for both (primary values,secondary values) of sintheta
is given by : .PV=primary value
Although I can see why this is true from a cast diagram .does anyone know how to prove this?

Thanks
From the symmetry of the sine graph? Alternatively, prove that
5. (Original post by Unbounded)
From the symmetry of the sine graph? Alternatively, prove that
I think I found what I was looking for .Thanks anyway

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