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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'...

start of by expanding the braquet which has got a power(x + 2y) (x + 2y) = X² + 2xy + 2xy + 4Y²then simplify that => x² + 4xy + 4y²then multiply that by (x -...

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 ...