Processing math: 100%

User interface language: English | Español

Date May 2008 Marks available 6 Reference code 08M.1.hl.TZ2.6
Level HL only Paper 1 Time zone TZ2
Command term Show that Question number 6 Adapted from N/A

Question

Show that π60xsin2xdx=38π24.

Markscheme

Using integration by parts     (M1)

u=xdudx=1, dvdx=sin2x and v=12cos2x     (A1)

[x(12cos2x)]π60π60(12cos2x)dx     A1

=[x(12cos2x)]π60+[14sin2x]π60     A1

Note: Award the A1A1 above if the limits are not included.

 

[x(12cos2x)]π60=π24     A1

[14sin2x]π60=38     A1

π60xsin2xdx=38π24     AG     N0

Note: Allow FT on the last two A1 marks if the expressions are the negative of the correct ones.

 

[6 marks]

Examiners report

This question was reasonably well done, with few candidates making the inappropriate choice of u and dvdx. The main source of a loss of marks was in finding v by integration. A few candidates used the double angle formula for sine, with poor results.

Syllabus sections

Topic 6 - Core: Calculus » 6.7 » Integration by parts.

View options