Question: If x= 2 cos e cosh B, y = 2 sin a sinh B. Prove that 4x sec (a + i) + sec (a

If x= 2 cos e cosh B, y = 2 sin a

If x= 2 cos e cosh B, y = 2 sin a sinh B. Prove that 4x sec (a + i) + sec (a - iB) = x + y - 2

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