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Hi, I'm looking for the best introductory astronomy book that will describe, in mathematical detail, the most important things about astronomy. I've seen Astronomy Demystified etc... and them kinds of books are terrible, no substance at all. I've also seen Meus Astronomical Algorithms and...

I have a question, If a, b, c & d are constants such that the limit as x->0 ; [ax^2 + sin bx + sin cx + sin dx] / [3x^2 + 5x^4 + 7x^6] = 8 find the value of the sum a + b + c + d. I'm looking for how to solve this solution, how do you find a,b,c & d? I'd imagine you'd factor out the "sin x"...