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cos^2(theta) -1

the question is unclear. and I give you medal for free. heheh, I don't know how to solve

oh thanks!

oh thanks!

Trig identities,\[\cos^2\theta-1=\sin^2\theta\]

nope

it wants me to simpify

Why not?
and that is simplified

\[-\cos^2(aht^2e)\]

Oh I see my mistake.. again

yea \[-\cos^2\theta \]
sorry about that :/

redo

what about this one
sec(theta)sin(theta)cot(theta)

*sin(theta)