Cho hàm số \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2 % da9iaadAgacaGGOaGaamiEaiaacMcacqGH9aqpdaWcaaqaaiaadIha % aeaadaGcaaqaaiaaisdacqGHsislcaWG4bWaaWbaaSqabeaacaaIYa % aaaaqabaaaaaaa!40ED! y = f(x) = \frac{x}{{\sqrt {4 - {x^2}} }}\). Tính y’(0) bằng:
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Lời giải:
Báo saiTa có : \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiaacE % cacqGH9aqpcaWGMbGaai4jaiaacIcacaWG4bGaaiykaiabg2da9maa % bmaabaWaaSaaaeaacaWG4baabaWaaOaaaeaacaaI0aGaeyOeI0Iaam % iEamaaCaaaleqabaGaaGOmaaaaaeqaaaaaaOGaayjkaiaawMcaamaa % CaaaleqabaGaai4jaaaaaaa!44AE! y' = f'(x) = \)\(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeyypa0ZaaS % aaaeaacaWG4bGaai4jaiaac6cadaGcaaqaaiaaisdacqGHsislcaWG % 4bWaaWbaaSqabeaacaaIYaaaaaqabaGccqGHsislcaWG4bGaaiOlam % aabmaabaWaaOaaaeaacaaI0aGaeyOeI0IaamiEamaaCaaaleqabaGa % aGOmaaaaaeqaaaGccaGLOaGaayzkaaWaaWbaaSqabeaacaGGNaaaaa % GcbaGaaGinaiabgkHiTiaadIhadaahaaWcbeqaaiaaikdaaaaaaaaa % !4951! \frac {x'.\sqrt 4 - x^2 - x.( \sqrt 4 - x^2 )}{{4 - {x^2}}}\) \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeyypa0ZaaS % aaaeaadaGcaaqaaiaaisdacqGHsislcaWG4bWaaWbaaSqabeaacaaI % YaaaaaqabaGccqGHRaWkdaWcaaqaaiaadIhadaahaaWcbeqaaiaaik % daaaaakeaadaGcaaqaaiaaisdacqGHsislcaWG4bWaaWbaaSqabeaa % caaIYaaaaaqabaaaaaGcbaGaaGinaiabgkHiTiaadIhadaahaaWcbe % qaaiaaikdaaaaaaaaa!44D2! = \frac{{\sqrt {4 - {x^2}} + \frac{{{x^2}}}{{\sqrt {4 - {x^2}} }}}}{{4 - {x^2}}}\)
\(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeyO0H4Taam % yEaiaacEcadaqadaqaaiaaicdaaiaawIcacaGLPaaacqGH9aqpdaWc % aaqaamaakaaabaGaaGinaaWcbeaaaOqaaiaaisdaaaGaeyypa0ZaaS % aaaeaacaaIXaaabaGaaGOmaaaaaaa!4180! \Rightarrow y'\left( 0 \right) = \frac{{\sqrt 4 }}{4} = \frac{1}{2}\)