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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

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Other answers:

oh thanks!
oh thanks!
Trig identities,\[\cos^2\theta-1=\sin^2\theta\]
it wants me to simpify
Why not? and that is simplified
Oh I see my mistake.. again
yea \[-\cos^2\theta \] sorry about that :/
@lala2 he gave you the formula, you replace and figure out the answer. 1= sin^2 +cos^2
what about this one sec(theta)sin(theta)cot(theta)
\[\sec \theta*\sin \theta*\cot \theta=\frac{ 1 }{ \cos \theta }*\sin \theta*\frac{ \cos \theta }{ \sin \theta }=\frac{ \sin \theta }{ \cos \theta }*\frac{ \cos \theta }{ \sin }\]

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