Tính đạo hàm của hàm số sau: \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2 % da9maabmaabaGaci4CaiaacMgacaGGUbGaamiEaiabgUcaRiGacoga % caGGVbGaai4CaiaadIhaaiaawIcacaGLPaaadaahaaWcbeqaaiaaio % daaaaaaa!42F2! y = {\left( {\sin x + \cos x} \right)^3}\)
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Lời giải:
Báo saiÁp dụng \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaeWaaeaaca % WG1bWaaWbaaSqabeaacqaHXoqyaaaakiaawIcacaGLPaaadaahaaWc % beqaaiaac+caaaGccaGGSaaaaa!3BE7! {\left( {{u^\alpha }} \right)^/},\) với \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyDaiabg2 % da9iGacohacaGGPbGaaiOBaiaadIhacqGHRaWkciGGJbGaai4Baiaa % cohacaWG4baaaa!407B! u = \sin x + \cos x\)
\(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiaacE % cacqGH9aqpcaaIZaWaaeWaaeaaciGGZbGaaiyAaiaac6gacaWG4bGa % ey4kaSIaci4yaiaac+gacaGGZbGaamiEaaGaayjkaiaawMcaamaaCa % aaleqabaGaaGOmaaaakiaac6cadaqadaqaaiGacohacaGGPbGaaiOB % aiaadIhacqGHRaWkciGGJbGaai4BaiaacohacaWG4baacaGLOaGaay % zkaaWaaWbaaSqabeaacaGGVaaaaOGaeyypa0JaaG4mamaabmaabaGa % ci4CaiaacMgacaGGUbGaamiEaiabgUcaRiGacogacaGGVbGaai4Cai % aadIhaaiaawIcacaGLPaaadaahaaWcbeqaaiaaikdaaaGcdaqadaqa % aiGacogacaGGVbGaai4CaiaadIhacqGHsislciGGZbGaaiyAaiaac6 % gacaWG4baacaGLOaGaayzkaaGaaiOlaaaa!67A2! y' = 3{\left( {\sin x + \cos x} \right)^2}.{\left( {\sin x + \cos x} \right)^/} = 3{\left( {\sin x + \cos x} \right)^2}\left( {\cos x - \sin x} \right).\)