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@Apu
Note for OP
+solved @user1 @user2...
to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.What did I do wrong

cos x derivative -sin x, that's correct!
and 2^-x derivative is -ln2 2^-x
so - - is + 😄 @Gamertug
Isn't a^x derivative a^x Ln a . So where does - come from
from the -x
Where is -x , its In the power so it will just be 1/a lna
Still no -ve should come
chain rule bro, you have to differentiate the -x too
oh yee forgot thx
+solved @lim me → ∞
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