ଯଦି a cot θ + b cosec θ = p ଏବଂ b cot θ + a cosec θ = q ତେବେ p2 - q2 ହେଉଛି ______। 

1
a2 + b2
2
a2 - b2
3
b2 - a2
4
b - a

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