Find the general solutions of sin(delta)=-1

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`sin(delta)=-1`

`sin(delta)=-sin(pi/2)`

`sin(delta)=sin(pi/2)`

`sin(delta)=sin(pi+pi/2)`

`sin(delta)=sin((3pi)/2)`

`delta=npi+(-1)^n((3pi)/2)`

Where n is an integer.

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