Always that we start a new stage in our academic life we are told that it is going to be really more difficult that what we've been seeing before, in part that's true but do not be afraid because of that. Here in Venezuela it is particularly true if you are going to start studies in a serious university like the Simón but as Adidas "impossible is nothing".
Even so, my first week passed very easy, I had even been relaxed until now, when the first difficulty appears: How to demonstrate that every number is odd or even? Why Cos (x + y) = CosxCosy - SinxSiny? and so on... , this has made me search the web and I found some useful results that I think if you're in a similar situation you may find then useful too, Happy Mathematics!!
RapidTables.com contains quick reference information and tools, as simplest as the sentence, it could help you pull trough in a hurry.
Mathbrain is the YouTube channel of the Chilean professor Nelson Lillo Terán and he explains very well with short lessons about Maths, Chem and Physics. This is the video that makes me arrive to his channel:
Khanacademy.org the best internet tool that I've ever found to get more knowledge
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