Cho hàm số \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2 % da9iaadAgadaqadaqaaiaadIhaaiaawIcacaGLPaaacqGH9aqpciGG % 0bGaaiyyaiaac6gadaqadaqaaiaadIhacqGHsisldaWcaaqaaiaaik % dacqaHapaCaeaacaaIZaaaaaGaayjkaiaawMcaaaaa!45F9! y = f\left( x \right) = \tan \left( {x - \frac{{2\pi }}{3}} \right)\). Giá trị f'(0) bằng:
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Lời giải:
Báo sai\(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiaacE % cacqGH9aqpdaWcaaqaaiaaigdaaeaaciGGJbGaai4Baiaacohadaah % aaWcbeqaaiaaikdaaaGcdaqadaqaaiaadIhacqGHsisldaWcaaqaai % aaikdacqaHapaCaeaacaaIZaaaaaGaayjkaiaawMcaaaaaaaa!43ED! y' = \frac{1}{{{{\cos }^2}\left( {x - \frac{{2\pi }}{3}} \right)}}\)
f'(0) = 4