(4) prove that if a1, a2, an and b are sets, then (aj – b) n(a2 – b) n (an – b) = (an an n an) – b.

1. what is the phythaforean theorem? 2.what do we use it for? 1.what is the distance formula ? 2.what do we use it for?

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Find the exact value of each of the following. in each case, show your work and explain the steps you take to find the value. (a) sin 17π/6 (b) tan 13π/4 (c) sec 11π/3