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Sheet 5. Derivatives. L'Hospital's Rule

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Faculty of Management  Mathematics  Exercises

Sheet 5. Derivatives. L'Hospital's Rule

Exercise 5.1. Dierentiate the following functions:

1) f(x) = 3 2) f(x) = x4 + 3x2 1x +

x 3) f(x) = 2x3− x2 4) f(x) = 5x − 1

3 − 2x 5) f(x) = x2− 1

x2 + 1 6) f(x) = 2

x3− 1 7) f(x) = x√

1 + x2 8) f(x) = (√

x + 1)( 1

√x − 1) 9) f(x) = x2e 10) f(x) =

µ

x3+ 1 x2

ex 11) f(x) = 10x 12) f(x) = x

4x 13) f(x) = 2√

x − 3 ln x + 1 14) f(x) = x ln x 15) f(x) = ln x 1 + x2 16) f(x) = log3x 17) f(x) = sin x + cos x 18) f(x) = x3sin x 19) f(x) =√

x cos x 20) f(x) = sin x

x4+ 4 21) f(x) = sin x − cos x sin x + cos x 22) f(x) = arcsin x + arccos x 23) f(x) = x arcsin x 24) f(x) = x + arctg x 25) f(x) =q

1−x

1+x 26) f(x) = ln(ex+

1 + ex) 27) f(x) = e(x2−3x−4) 28) f(x) = cos1 −√

x 1 +

x 29) f(x) = (2x3− 1)5 30) f(x) =

µ1 + x2 1 + x

5

31) f(x) =

µ sin x 1 + cos x

3

32) f(x) = cos34x 33) f(x) =

√4x2+ 2 3x4 34) f(x) = (2x + 1) 22x+1 35) f(x) = (1 +√4

x) tg (√

x) 36) f(x) = sin 2x cos2x 37) f(x) = arcsinx2 38) f(x) = arctg 2x

1 − x2 Exercise 5.2. For the given functions f nd f0, f00, f000:

a) f(x) = x ln x b) f(x) = (x2+ x + 1) cos x c) f(x) = x2+ 1 Exercise 5.3. Verify if the given function fulls the condition:

a) y = exsin x, y00− 2y0+ 2y = 0 b) y = ln2x − 2 ln x, y00+ 1

xy0 2 x2 = 0

Last update: November 3, 2008 1

(2)

5 Derivatives. L'Hospital's Rule

Exercise 5.4. Using L'Hospital's Rule nd the limits:

a) lim

x→1

x3− 1

x2− 1 b) lim

x→0+x ln x c) lim

x→−∞x

³ ex1 − 1

´

d) lim

x→0

ex− x − 1

x2 e) lim

x→0

ln (1 + x)

x f) lim

x→e

ln x − 1 x − e g) lim

x→0

1 − cos x

x2 h) lim

x→0

sin x

x i) lim

x→0

sin x x cos x j) lim

x→+∞

ex

x k) lim

x→+∞

ln x

x l) lim

x→+∞

ln x√ x m) lim

x→1+

µ x

x − 1 1 ln x

n) lim

x→0+xsin x

Last update: November 3, 2008 2

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