R1 2012 vår LØSNING

Oppgave 1:

a)

1)

<tex>f(x) = 5x^3+x-4 \\ f'(x) = 3 \cdot 5x^2 + 1 \\ f'(x) = 15x^2 + 1 </tex>

2)

<tex>g(x) = 5e^{3x} \\ u = 3x \wedge u' = 3 \\ g'(x) = 5e^u \cdot u' \\ g'(x) = 15e^{3x}</tex>

b)

<tex> 2ln(\frac{a^2}{b}) + ln (a \cdot b) - 3ln a = \\ 2ln a^2 - 2ln b + ln a + lnb - 3 lna = \\4ln a - 2ln b + ln a + lnb - 3 lna = \\ 2lna - lnb </tex>