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If a = sin − 1 (sin(5)) and b = cos − 1 (cos(5)), then a 2 + b 2 is equal to

1. 4 π 2 − 20 π + 50
2. 25
3. 4 π 2 + 25
4. 8 π 2 − 40 π + 50

Correct answer: 8 π 2 − 40 π + 50

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