Mohon bantu jawabannya kak yang materi integral fungsi trigonometri
Jawab:
Penjelasan dengan langkah-langkah:
intergral trigonometri
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soal
∫ sin³ x cos² x dx
= ∫ sin x. sin² x. cos² x dx
= ∫ sin x (1 – cos² x) . cos² x dx
= ∫ cos² x sin x – cos⁴ sin x dx
u = cos x
du = – sin x . dx
= ∫ cos² x sin x – cos⁴ sin x dx = ∫( – u² + u⁴) du
= - ¹/₃ u³ + ¹/₅ u⁵ + c
= - ¹/₃ cos³ x + ¹/₅ cos⁵ x + c
atau
= ¹/₃₀ cos³ x ( – 10 + 6 cos² x ) + c
= ¹/₃₀ cos³ x ( – 10 + 3 (2 cos² x )) + c
= ¹/₃₀ cos³ x ( – 10 + 3 (cos 2x + 1)) + c
= ¹/₃₀ cos³ x ( – 10 + 3cos 2x +3) + c
= ¹/₃₀ cos³ x ( 3 cos 2x - 7 ) + c