Matematiikan perusmetodit I/Sov.
Harjoitus 10, syksy 2008
1. Olkoon f(x) =
x2sin 1x ,kun x 6= 0 0 ,kun x = 0 . Tutki onko f0(0) olemassa.
2. M¨a¨ar¨a¨a m¨a¨aritelm¨an avulla
f0(x0), kun f(x) = 1x ja x0 6= 0.
3. M¨a¨ar¨a¨a f0(x), kun
a) f(x) = (x2 + 5)5(x3−2)3 b) f(x) =
x+1 x−1
3
c) f(x) = cos(x+ sinx) d) f(x) = q
xp x√
x e) f(x) = |x−1| f) f(x) = √ 1
x2+1
4. M¨a¨ar¨a¨a f0(x), kun
a) f(x) = cos(x+ sinx) b) f(x) = tanx 1 + tanx c) f(x) = arcsin
2x x2+1
d) f(x) = arctan√ x e) f(x) = ln(x+
√
x2+ 1) f) f(x) = logax√ x.
5. M¨a¨ar¨a¨a (f−1)0(x0), kun a) f(x) = ex +x ja x0 = 1, b) f(x) = 1 + 2x+2, x0 > 1.
6. M¨a¨ar¨a¨a f0(x), kun
a) f(x) = xxx, b) f(x) = xsin x, c) (logx)logx.