Question: If cos (x + y) = a + i, show that (i) x sec -y cosec = 1 (ii) x sech B + y

If cos (x + y) = a + i, show that (i)

If cos (x + y) = a + i, show that (i) x sec -y cosec = 1 (ii) x sech B + y cosech B = 1. a

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