Question

by working out my problem can someone check it:
sec^2-tan^2
(1/cos x1/cos)- (sin/cos x sin/cos)
1/cos^2-sin^2/cos^2
1-sin^2/cos^2
cos^2/cos^2
=1

Answer 1

That should be correct, but theres a much faster way.

Answer 2

Start from sin^2+cos^2=1

Answer 3

divide both sides by cos^2

Answer 4

rearrange to make it sec^2-tan^2

Answer 5

????

Answer 6

Profit.

Answer 7

yea

Answer 8

thats right