4. Use Osborn's rule or otherwise to prove that: - a) 1 tanh2x = sechx -...

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4. Use Osborn's rule or otherwise to prove that: - a) 1 tanh2x = sechx - b) coth2x 1 = cosechx c) cosh2x=2sinh2x + 1 d) tanh2x = e) coshx = f) cothx = 2cosech2x + tanhx 4. Use Osborn's rule or otherwise to prove that: - a) 1 tanh2x = sechx - b) coth2x 1 = cosechx c) cosh2x=2sinh2x + 1 d) tanh2x = e) coshx = f) cothx = 2cosech2x + tanhx