If $x = a \sec \theta + b \tan \theta$ and $y = a \tan \theta + b \sec \theta$, then what is the value of $x^2 - y^2$?

Options:

• A: $a^2 - b^2$
• B: $b^2 - a^2$
• C: $a^2 + b^2$
• D: 1

Related Practice Questions:

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