শূন্যস্থান পূরণ করো
The expression $ab = \frac{(a+b)^2 - (a-b)^2}{4}$ is derived by using the concept of the difference of __.
According to Corollary 1, $a^2 + b^2 = (a + b)^2 - 2ab$ is known as the __ corollary.
The formula $(a + b)^2 = (a - b)^2 + 4ab$ can also be seen as Corollary __.
The expression $(a - b)^2$ is expanded as $a^2 - 2ab + b^2$ by applying the __ formula.
In the expression $(a + b)^2$, the term $2ab$ represents the __ term.
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