শূন্যস্থান পূরণ করো
In the formula $(a + b + c)^2 = a^2 + + c^2 + 2ab + 2bc + 2ac$, the missing expression is b^2.
In the expansion of $(a + b + c)^2$, the term $c^2$ represents the square of the value .
The expression $(a + b - c)^2$ gives $a^2 + b^2 + c^2 + 2ab - 2bc - .
The term $2ab$ represents the product of $2$, $a$, and .
For the algebraic formula $(a + b + c)^2$, the coefficient of $bc$ in the expansion is .
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