Question

Can someone help me with a derivative problem? picture below

Answer 1

how does -1 + sec^2 x = tan^2 x?

Answer 2

start with
\[\sin^2(x)+\cos^2(x)=1\] then divide all by \(\cos^2(x)\) and you will get it

Answer 3

sec^2 x = tan^2 x?

Answer 4

no, if you divide all by \(\cos^2(x)\) you get
\[\tan^2(x)+1=\sec^2(x)\]

Answer 5

oh right! thank you so much! :)