Hàm số \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2 % da9iaadIhadaahaaWcbeqaaiaaikdaaaGccaGGUaGaci4yaiaac+ga % caGGZbGaamiEaaaa!3E6A! y = {x^2}.\cos x\) có đạo hàm là:
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Lời giải:
Báo sai\(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiaacE % cacqGH9aqpdaqadaqaaiaadIhadaahaaWcbeqaaiaaikdaaaaakiaa % wIcacaGLPaaacaGGNaGaaiOlaiGacogacaGGVbGaai4CaiaadIhacq % GHRaWkcaWG4bWaaWbaaSqabeaacaaIYaaaaOGaaiOlamaabmaabaGa % ci4yaiaac+gacaGGZbGaamiEaaGaayjkaiaawMcaaiaacEcacqGH9a % qpcaaIYaGaamiEaiaac6caciGGJbGaai4BaiaacohacaWG4bGaeyOe % I0IaamiEamaaCaaaleqabaGaaGOmaaaakiaac6caciGGZbGaaiyAai % aac6gacaWG4baaaa!5976! y' = \left( {{x^2}} \right)'.\cos x + {x^2}.\left( {\cos x} \right)' = 2x.\cos x - {x^2}.\sin x\)