Question

cosx(1+tan^2x)

Answer 1

\[1+\tan ^{2}x=\sec ^{2}x\]

Answer 2

that's an identity, then you're left with cos and sec^2
from there you can simplify it again

Answer 3

how do you do simplify it again?

Answer 4

secx=1/cos, right?

Answer 5

i think

Answer 6

cosx(1+tan^2x)
cosxsecx
cosx/cosx
1