a) f(x) = exp(Co(2x3))
f ' (x) = exp(cos(2x3)) * (-sin(2x3)) * 6x = 6xSin(2x3) exp(Cos(2x3) )
f "(x) = 6 { xSin(2x3) * [6xSin(2x3) exp(Cos(2x3)] +
exp(Cos(2x3) [6Sin(2x3) + 6x* Cos(2x3) * 6x ] }
= 6exp(Cos(2x3) { 6x2 Sin2(2x3) + 6 Sin(2x3) + 36x2 Cos(2x3) }
b) f(x) = 20x3 +12x2 -8xSin(7x)
f '(x) = 60 x2 +24x - 8 ( Sin(7x) +x * Cos(7x) *7)
= 60 x2 +24x - 8sin(7x) -56xCos(7x)
f " (x) = 120 x + 24 - 8*7 *Cos(7x) - 56( Cos(7x) - x* Sin(7x) *7)
= 120x +24 - 102 Cos(7x) +392 xSin(7x)
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