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# d/db(tg(b)) = a/L , Derive it..? watch

1. what´s the value of db ?

d/db(tg(b)) = a/L

a,L : constants

I take the advantage of this topic to ask something, in my HP calculator the value of d/db(tg(b)) shows SQ(tan(a))+1

what is that SQ?

thanks!
2. d(tg(b)) = a*db/L
db =(L/a) d(tg(b))

It's impossible to now what the answer is since you haven't defined tg(b). If t=1 g(b) = 1, then db = 0. If t=(a/L) and g(b) = 1, db = 1. tg(b) could literally be anything which can be integrated (since it's anti-derivative exists).
3. I think that "tg" is another way of saying "tan". But I still don't understand the question! MarcosJr, what do a and L mean?
4. (Original post by MarcosJr)
I take the advantage of this topic to ask something, in my HP calculator the value of d/db(tg(b)) shows SQ(tan(a))+1

what is that SQ?
It means "square".

(d/db) tan(b)
= sec^2(b)
= tan^2(b) + 1
= SQ(tan(b)) + 1
5. sorry guys, tg means tan

thanks for the explanation!
6. so, square means that the value is squared ² ?
7. (Original post by MarcosJr)
so, square means that the value is squared 2 ?
Yes, SQ(10) = 100.

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