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Problem 14 - Entrance Test

Evaluate (tan 45° + cot 45°) / (sin 90° - cos 0°).

Correct: C

We use the standard trigonometric values: tan 45° = 1, cot 45° = 1, sin 90° = 1, cos 0° = 1. Substitute these values into the expression: (1 + 1) / (1 - 1) = 2 / 0. Division by zero is undefined.