Question: If cosh x = find: 2 (i) cosh 2x (ii) sinh 2 3. If cosh x = sec0, then prove that tanh2 2 x

If cosh x = find: 2 (i) cosh 2x (ii) sinh 2 3. If cosh x = sec0, then prove that tanh2 2 x

If cosh x = find: 2 (i) cosh 2x (ii) sinh 2 3. If cosh x = sec0, then prove that tanh2 2 x - 2 given that cosh 2x = tan = (2) 1+tanh 2 1_ tanh x 4. Solve the hyperbolic equations: (i) 3 coshx+5 sinh ; = 5 (ii) 2 cosh 2x = 9 cosh x7 5. If cos a cosh B = 82 - and sin a sinh 3 prove that: (i) sec(a - i) + sec(a + i) = (ii) sec(a - i) - sec(a + i) = = 4x x + y -4iy x + y Y 2

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