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JavaScript is important part of any web application, it useful for validating input in a web browser without needing to go to the server. It useful for mainulating HTML DOM, CSS when  user is interacti...

Often, it is more about how an author says something rather than what they say. So, the books you're reading might be about completely different things, and have different subject matters, but the way ...

since f(x)=0 write

9x²-4=0

move the x's to one side and the numbers to the other.

so 9x²=4

then to get rid of the 9 divide ...

In order to differentiate this expression, you need to use the chain rule. 

The chain rule gives: f'(x) = uv' + u'v.

The u and the v are two parts of the o...

firsly sketch out the 2-2i on an argand diagrm and draw a line from (0,0) to (2,-2). With the shortest distance Mark the angle theta from the positive x-axis to the line to see whether the argument is ...