I have a question asking what is equal to -sec^2x. I believe that the answer is -tan^2x-1. However, I am not completely positive

Question

anonymous · Answer

I came to this conclusion by making 1+ tan^2 =sec^2 all negative to get -1 - tan^2x = -sec^2 which is also equal to -tan^2x -1 = -sec^2x. Is this correct or have i done something wrong? Please helpp

amistre64 · Answer

its correct

anonymous · Answer

okay thank you!

amistre64 · Answer

$$sec^2=\frac1{cos^2}$$
would also seem fine

anonymous · Answer

well it was a multiple choice questions with the answers:
a. tan^2 x -1
b. -tan^2 x +1
c. -cos^2 x
d. -tan^2 x -1 
e. none of the above
I said that it was D. @amistre64

amistre64 · Answer

D does fit best with the options given :)

anonymous · Answer

ok thanks :)