Derivative of (1/3)tan^3(x) + tan(x)

[@DerivativesForYou]

❤ 𝐏𝐥𝐞𝐚𝐬𝐞 𝐒𝐔𝐁𝐒𝐂𝐑𝐈𝐁𝐄 𝐭𝐨 𝐡𝐞𝐥𝐩 𝐦𝐞 𝐠𝐫𝐨𝐰 𝐭𝐡𝐢𝐬 𝐜𝐡𝐚𝐧𝐧𝐞𝐥! 𝐓𝐡𝐚𝐧𝐤 𝐲𝐨𝐮!

[@nandakumarcheiro]

1/cos^2 x . 1/cos^2 x=1/cos^4 x.

[@nandakumarcheiro]

Something wrong with last multiplication.

[@nandakumarcheiro]

Again you do a lot of mistake. Check up your answer or remove the vedio.

[@DerivativesForYou]

Hi! I don't understand what you are saying... In the last two steps I wrote tan^2(x)+1 as 1/cos^2(x) and then multiply 1/cos^2(x) by 1/cos^2(x) which is 1/cos^4(x)... I'm sorry but I don't see the mistake...