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d1=[log(S/E)+(r+(sigma)2(T-t)]/sigma*Sq(T-t)

d2=[log(S/E)+(r-(sigma)2(T-t)]/sigma*Sq(T-t)

Sq means square root.

S is price of asset

E is the Excercise price

r is interest rate

sigma is the volatility

T-t is time to maturity

d2 is very similar to d1 but notice the minus sign.

Another useful property is d2=d1-Sq(T-t)

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Q: What are D1 and D2 in Black Schole model?
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