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首先，旅游业的好处大家都已经很清楚。旅游越来越便宜，所以一般的人都可以出国。他们一面有机会了解新的文化、食物、语言和历史，另一方可以帮当地的人赚钱。世界各国互相联系。但是也有坏处， 比如说环境破坏。这么多人出去旅行，有地方变成旅游热点，有时候没办法应付对该地方文化，环境和社会的后果。

Write out the product rule: if y=f(x)g(x) where f and g are functions, dy/dx = f'(x)g(x) + f(x)g'(x)
Substitute in the expressions from the question:Therefore if f(x)=cos(3x) and g(x) = cosec(5x), f'...

First thing you would do is write down the coordinates where the tangent meets the curve. After that you would differenciate the equation (f(x)) of the curve (do dy/dx) in order to get f'(x).Then you woul...

We can denote the sides of the rectangle with a and b. As one side of the separated area is going to be the wall of the house, we do not have to use a fence there. Therefore, we will have two sides, one ...

Transcription begins with DNA helicase unwinding the DNA into two seperate strands.As the DNA unwinds, RNA nucleotides form hydrogen bonds with their complementary base pairs. Uracil binds to adenine, and...