Hàm số \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2 % da9iGacogacaGGVbGaaiiDaiaaiodacaWG4bGaeyOeI0YaaSaaaeaa % caaIXaaabaGaaGOmaaaaciGG0bGaaiyyaiaac6gacaaIYaGaamiEaa % aa!4384! y = \cot 3x - \frac{1}{2}\tan 2x\) có đạo hàm là
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Lời giải:
Báo sai\(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGabmyEayaafa % Gaeyypa0JaeyOeI0YaaSaaaeaacaaIZaaabaGaci4CaiaacMgacaGG % UbWaaWbaaSqabeaacaaIYaaaaOGaaG4maiaadIhaaaGaeyOeI0YaaS % aaaeaacaaIXaaabaGaaGOmaaaacqGHflY1daWcaaqaaiaaikdaaeaa % ciGGJbGaai4BaiaacohadaahaaWcbeqaaiaaikdaaaGccaaIYaGaam % iEaaaacqGH9aqpcqGHsisldaWcaaqaaiaaiodaaeaaciGGZbGaaiyA % aiaac6gadaahaaWcbeqaaiaaikdaaaGccaaIZaGaamiEaaaacqGHsi % sldaWcaaqaaiaaigdaaeaaciGGJbGaai4BaiaacohadaahaaWcbeqa % aiaaikdaaaGccaaIYaGaamiEaaaaaaa!59C8! y' = - \frac{3}{{{{\sin }^2}3x}} - \frac{1}{2} \cdot \frac{2}{{{{\cos }^2}2x}} = - \frac{3}{{{{\sin }^2}3x}} - \frac{1}{{{{\cos }^2}2x}}\)