How can I graph y=sec^4x-sec^2x on a calculator

Please include step-by-step instructions, thanks! (The calculator is a TI-84)

Well since secant is just (1/cosX), simply input that exact thing in parenthesis in for sec.

For ex)

y=(1/cosX)^4-(1/cosX)^2

*make sure to use parenthesis exactly as I showed it

If you ever don't have a calculator just use

https://www.desmos.com/calculator (the best online graphing calculator)

y = sec^4(x) - sec^2(x)
= 1/cos^4(x) - 1/cos^2(x)
= 1/cos^4(x) - [1/cos^2(x)]*[cos^2(x)/cos^2(x)]
= 1/cos^4(x) - cos^2(x)/cos^4(x)
= [1 - cos^2(x)]/cos^4(x)
= sin^2(x)/cos^4(x)
= tan^2(x)/cos^2(x)
= [tan(x)/cos(x)]^2

I think this is as simple as you can get.