Answers by visitors named: What Zit Tooya

Can'tSayMyName is right

1c, 2b, 3a, 4a, 5b, 6a, 7c, 8d, 9c, 10b

y'=-8sin(4x)cos(4x) y"=-8[sin(4x)(-sin(4x))*4+cos(4x)(cos(4x))*4] y"=-8[-4sin^2(4x)+4cos^2(4x)] y"=-32[cos^2(4x)-sin^2(4x)]