Prove the result in equation (11.7). (Hint: For the first part of the relationship, consider (a)

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First, let's consider a portfolio consisting of a European call option plus an amount of cash eq

Prove the result in equation (11.7). (Hint: For the first part of the relationship, consider (a) a portfolio consisting of a European call plus an amount of cash equal to $K$, and (b) a portfolio consisting of an American put option plus one share.)