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Lời giải:
Báo saiÁp dụng công thức nguyên hàm: \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaa8qaaeaaca % qGJbGaae4BaiaabohadaqadaqaaiaabggacaWG4bGaey4kaSIaamOy % aaGaayjkaiaawMcaaiaabsgacaWG4bGaeyypa0ZaaSaaaeaacaaIXa % aabaGaamyyaaaacaqGZbGaaeyAaiaab6gadaqadaqaaiaabggacaWG % 4bGaey4kaSIaamOyaaGaayjkaiaawMcaaiabgUcaRiaadoeaaSqabe % qaniabgUIiYdaaaa!4E3B! \int {{\rm{cos}}\left( {{\rm{a}}x + b} \right){\rm{d}}x = \frac{1}{a}{\rm{sin}}\left( {{\rm{a}}x + b} \right) + C} \)
Ta có: \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaa8qaaeaaca % qGJbGaae4BaiaabohacaaIYaGaamiEaiaabsgacaWG4bGaeyypa0Za % aSaaaeaacaaIXaaabaGaaGOmaaaacaqGZbGaaeyAaiaab6gacaaIYa % GaamiEaiabgUcaRiaadoeaaSqabeqaniabgUIiYdaaaa!471D! \int {{\rm{cos}}2x{\rm{d}}x = \frac{1}{2}{\rm{sin}}2x + C} \)