Will you solve for θ \theta?

Geometry Level 3

If (1+sinθ)(1+cosθ)=54 \left( 1+ \sin \theta \right) \left( 1+ \cos \theta \right) = \dfrac{5}{4}, then what is the value of (1sinθ)(1cosθ) \left( 1- \sin \theta \right) \left( 1- \cos \theta \right) ?

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