1) * lim 1 
x  0

cos x
x 2

d/s: 1
2

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Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

Y+ 2/y is it a polynomial in one variable or not? and if so, why?