Question

How do I solve 8cos x = (sec x)^2?

Answer 1

sec^2x = 1/cos^2x

Answer 2

8cos^3x=0

Answer 3

cos(pi/2) = 0

Answer 4

so 8cos^3(pi/2)=0

Answer 5

I got lost on the first step.. Sorry, can you explain it more?

Answer 6

sure, first you need to memorize all of the identitites
memorize : sec(x) = 1/cos(x)

Answer 7

whoa whoa whoa,
\[8\cos^2(x) = 1\] not zero...

Answer 8

so sec^2(x) = 1/cos^2(x)

Answer 9

ah right 1 my bad

Answer 10

So like this?