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Curious
Posted:
Aug 2, 1995 1:02 AM
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>I think speed and certain types of memorization are still important. For
>example if a student learns sin(2x) = 2sin(x)cos(x), he may forget it 6
>months later but 2 years later he will see sin(2x) and at least know it can
>be expanded. The student who doesn't learn these IDs OFTEN won't even know
>enough to look it up in a book.
>
Can anyone give me a real world *application* that might involve knowing the
aforementioned trig identity? I'm not implying that it's not worth knowing.
I'm really just curious because, in the 10 years or so since I first learned
it, I don't recall ever using it outside of my trig and calculus classes.
How do people use these trig identities?
Norm Krumpe
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