Cho hàm số \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOzamaabm % aabaGaamiEaaGaayjkaiaawMcaaiabg2da9iGacshacaGGHbGaaiOB % amaabmaabaGaamiEaiabgkHiTmaalaaabaGaaGOmaiabec8aWbqaai % aaiodaaaaacaGLOaGaayzkaaaaaa!43F4! f\left( x \right) = \tan \left( {x - \frac{{2\pi }}{3}} \right)\). Giá trị f'(0) bằng
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Lời giải:
Báo sai\(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGabmOzayaafa % WaaeWaaeaacaWG4baacaGLOaGaayzkaaGaeyypa0ZaaSaaaeaacaaI % XaaabaGaci4yaiaac+gacaGGZbWaaWbaaSqabeaacaaIYaaaaOWaae % WaaeaacaWG4bGaeyOeI0YaaSaaaeaacaaIYaGaeqiWdahabaGaaG4m % aaaaaiaawIcacaGLPaaaaaGaeyO0H4TabmOzayaafaWaaeWaaeaaca % aIWaaacaGLOaGaayzkaaGaeyypa0ZaaSaaaeaacaaIXaaabaWaaSaa % aeaacaaIXaaabaGaaGinaaaaaaGaeyypa0JaaGinaaaa!5075! f'\left( x \right) = \frac{1}{{{{\cos }^2}\left( {x - \frac{{2\pi }}{3}} \right)}} \Rightarrow f'\left( 0 \right) = \frac{1}{{\frac{1}{4}}} = 4\)