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First let a = b = x such that:          

          cos(a + b) = cos(a)cos(b) - sin(a)sin(b)

becomes:

          cos(x + x) = cos(x)cos(x) - sin(x)sin(x)

Leading to:

     ...

Simple harmonic motion is defined as a form of periodic motion in which a point or body oscillates in such a way that the acceleration of the point or body is directly proportional to its displacement fro...

Jane's strong character is best seen in the context of her gender as she shows traits that trangress and push the boundaries of those expected of Victorian women. She is fiercely independent and she is fe...

An increase in temperature will increse the rate of a chemical reaction, and a decrease in temperature will decrese the rate. This is because the hotter the reactant particles are, the more kinetic energy...

in this speaking task, the student is usually expected to talk for about 5 minutes in a coversation with the teacher. it is important to use some key words and speech acts for the task. you have some time...