1. Actually this number look pretty accurate. I dont usually study on a daily basis, what I learn one day I onle use it again for the finals. When the finals come I do get to some topics taht look pretty weird. The changes that are mentioned before are pretty good, personally I wont do them. To say, study 10 minutos each day looks easy, but so much information of many things at a time is complicated. Maybe reviewing once every week might help as well.
2. I actually have two questions related to the past year. What are trigonometric functions like sine, cosine, tangent, and the inverses really useful for? Second,Id like to know why is it important to learn to factor parabolas?
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My first response would be, "What is playing soccer useful for?"
One might say, "Making your body stronger."
Sin and cos make your mind stronger.
From a very different perspective, consider life on this planet. It is totally dependent on the transfer of the sun's energy and it's absorption and reflection into and off of our atmospehere and lithosphere. In fact, the transfer of all energy (other than from direct impact) is carried out through the propagation of waves. Waves, such as those you see in the ocean transferring wind energy to the coast. Light, such as that required for photosynthesis, consists of waves. All wave motion can be modeled using sin and cos. If you really want to know one aspect of how this world works, then the trigonemtric functions, and their inverses, are tools that allow one to develop that understanding.
Another method is to sit naked on a mountain top chanting "Om."
I would like to add a small note on the usefulness of the sine and cosine functions. As you may know, many things in our daily life are periodic, meaning they keep recurring at regular intervals. Using the sine or cosine graphs we can further describe those motions. For example, if a kid is playing on a swing,we can use the graphof sine or cosine to show, to great accuracy, the time it takes to complete one swing or the length of the swing. The same can be done with springs, pendulums, etc.
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