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Problem 5 - Entrance Test

Simplify the expression (1 - sin²θ) / cos²θ.

Correct: C

We use the identity sin²θ + cos²θ = 1, which can be rearranged to 1 - sin²θ = cos²θ. Substitute this into the numerator of the expression: (cos²θ) / cos²θ. This simplifies to 1.