Question

Integral.....
What did I do wrong? Question & my solution below:

Answer 1

@dan815 @Astrophysics

Answer 2

@zepdrix can you please check my work? :c

Answer 3

Ahhh you silly billy!!
\(\large\rm \sec^2\theta=\tan^2\theta+1\)
\(\large\rm \color{red}{\sec^2\theta\ne\tan^2\theta-1}\)

Answer 4

Oh i see, thank you so much :o you're amazing

Answer 5

c: