Question

sec^(2)x -1 can you help prove it? i know its an identity tan^(2)x but can someone help me with the alg

Answer 1

did you try writing both sides in terms of sin and cos ?

Answer 2

1/cos^2x - sin^2x+cos^2x

I got there before, but then I dont know where to go from there

Answer 3

phi help me u know me

Answer 4

You have
\[ \frac{1}{\cos^2 x} - 1 \]
I would try writing 1 as cos^2 x / cos^2 x (so you have a common denominator)

Answer 5

oh I see

1- cos^2 / cos^2x

then 1-cos^2x = sin^2x

so sin^2x / cos^2x = tan^2x

Answer 6

yes

Answer 7

Thank you very much :D

Answer 8

come to my queastion phi please