what's the best SAT II Math Level II prep book?

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<p>I feel sorry for oryZa, she spent 10 mins on a 2 seconds derivation:</p>

<p>=sin(2x)
=sin(x+x)
=sin(x)cos(x)+cos(x)sin(x)
=2sin(x)cos(x)</p>

<p>P.S. I don’t like showoffs…</p>