Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

If a = sin θ + cos θ and b = sin θ - cos θ, then what is a(a - 1) + b(b - 1) equal to?

1
2sin θ 
2
2(1 - cos θ)
3
2 cos θ 
4
2(1 - sin θ)

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