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-Hydraulic action of the water erodes the banks of the river

-Small pieces of sediment carried by the river erode the banks via abrasion

-River beds and banks are erodes through corrosion ca...

The derivative of a function f(x) is a measure of how the function f changes as its variable x changes. You have already met an example of derivatives: the gradient, m,...

Sketching trigonometric graphs is all about working from the graphs you already know and seeing how they behave when added/multiplied/substracted from each other to sketch more complicated functions.

The best way to ensure a clear focus on the question throughout your essays is to plan beforehand. I like to make sure I have written 4-5 points on a scrap of paper, along with a link back to the question...

It depends on the situation. If you are talking to your boss, an older person or your teacher, in Italian it is important to remember that you need to use "Lei" to show respect. In older textboo...