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If a quadratic equation is of the form ax²+bx+c, calculate D (Discriminant) whose value is b²-4ac. 

If the value of D is negative, the equation has imaginary roots.<...

Such an integral looks difficult to manage; clearly it is a case of integration by parts, but neither part of the product appears to reduce easily into a nicer form.

The key here is use t...

When do you use n choose k?

Say you have n objects/elements, and each one can either be selected or not selected. ‘n choose k’ gives yo...