Question

1/sec^2x = ?

Answer 1

sec x = 1/cos x, and 1/sec^2 x = (1/sec x)(1/sec x) = ?

Answer 2

Sorry, I left something out. :) sec x = 1/cosx , so 1/sec x = 1/(1/cos x) = cos x

Answer 3

And so 1/sec^2 x = ?

Answer 4

cos^2 x ;)