Given that inverse trigonometric functions assume principal values only. Let x, y be any two real numbers in [-1, 1] such that cos-1x - sin-1y = α, where -π2 ≤ α ≤ π. Then, the minimum value of x2 + y2 + 2xy sin(α) is:

Which Indian independence movement leader was primarily known for his philosophy and practice of non-violent civil disobedience?

Who gave the call for 'Do or Die' during the Quit India Movement in 1942?

Which of the following revolutionary pairs were imprisoned together in Cellular Jail and faced harsh conditions, contributing significantly to the Indian independence movement?