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**c1c2**and

**2b**in the following equation. I do not know if I am to mulitply, divide, subtract or add.

E= L * (( a /2 ) * ( c1 + c2) + b / 6 * ( c1² +

**c1c2**+ c2² ) + ( a² /

**2b**))

Where: L = 1

a=375

b=45

c1=.33

c2=.33

My answer comes out to 62.205 but I do not know if this is right because I do not know what this c1c2 and 2b means.

Thanks very much.