Question

Tolong bantuin menyelesaikan tugas matematika aku donk, oh iya itu yg batas atas phi ya, bukan X

Answer 1

Π/2 = 90°
π/3 = 60°

π/2
∫ x cosx dx =
π/3

=| x sin x - cos x|(π/2 ....π/3)
= (π/2 - π/3) { sin π/2 - sin π/3)}  - { cos π/2 - cos π/3}
= π/6 (1 - 1/2√3) - (0 - 1/2)
= π/6 - π/12 √3 + 1/2
= 1/12 ( 2π - π√3 + 6)