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To use the integrating factor method your first order DE must be of the form dy/dx + f(x)y =g(x), where f(x) and g(x) are any functions that depend only on x. lets say f(x)=3x^2 and g(x)=2, (If I feel the...

The best kind of essay answer directly responds to the question. This may seem obvious, however it is something most students miss and is essential to getting the best marks.

Think of the amount of...

それ and あれ both mean "that". それ indicates closeness of the thing to the person you are talking to, while あれ sug...