Find the exact value of ∫(from 0 to π/2) θ sin(½θ) dθ.
- (a)Find the exact value of ∫(from 0 to π/2) θ sin(½θ) dθ.[4]
Mark scheme
Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.
- [*M1] Integrate by parts and reach aθcos(½θ) + b∫cos(½θ)dθ
- [A1] Complete integration and obtain indefinite integral –2θcos(½θ) + 4sin(½θ)
- [DM1] Substitute limits correctly, having integrated twice
- [A1] Obtain final answer (4–π)/√2, or exact equivalent
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