state gov Kerala (കേരളം) PSC Divisional Accountant Test Series 2025 Quantitative Aptitude Trigonometry

If A = a cosec θ + b cot θ and B = a cot θ + b cosec θ, then what is the value of A2 - B2?

1
ab
2
(a + b)
3
(a2 - b2)
4
(a - b)
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