Đạo hàm của hàm số \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2 % da9iGacshacaGGHbGaaiOBamaaCaaaleqabaGaaGOmaaaakiaadIha % cqGHsislciGGJbGaai4BaiaacshadaahaaWcbeqaaiaaikdaaaGcca % WG4baaaa!4269! y = {\tan ^2}x - {\cot ^2}x\) là
Hãy suy nghĩ và trả lời câu hỏi trước khi xem đáp án
Lời giải:
Báo sai\(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGabmyEayaafa % Gaeyypa0JaaGOmaiGacshacaGGHbGaaiOBaiaadIhacaGGUaWaaSaa % aeaacaaIXaaabaGaci4yaiaac+gacaGGZbWaaWbaaSqabeaacaaIYa % aaaOGaamiEaaaacqGHsislcaaIYaGaci4yaiaac+gacaGG0bGaamiE % aiaac6cadaqadaqaaiabgkHiTmaalaaabaGaaGymaaqaaiGacohaca % GGPbGaaiOBamaaCaaaleqabaGaaGOmaaaakiaadIhaaaaacaGLOaGa % ayzkaaGaeyypa0ZaaSaaaeaacaaIYaGaciiDaiaacggacaGGUbGaam % iEaaqaaiGacogacaGGVbGaai4CamaaCaaaleqabaGaaGOmaaaakiaa % dIhaaaGaey4kaSYaaSaaaeaacaaIYaGaci4yaiaac+gacaGG0bGaam % iEaaqaaiGacohacaGGPbGaaiOBamaaCaaaleqabaGaaGOmaaaakiaa % dIhaaaaaaa!65AD! y' = 2\tan x.\frac{1}{{{{\cos }^2}x}} - 2\cot x.\left( { - \frac{1}{{{{\sin }^2}x}}} \right) = \frac{{2\tan x}}{{{{\cos }^2}x}} + \frac{{2\cot x}}{{{{\sin }^2}x}}\)