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sin ( 90 + theta ) = cos theta prove^

Mathematics
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i guess it depends on what you can use if you can use the addition angle formula, that would work if not maybe with a triangle you can see it
i want to do with the triangle one but m wondering how will you show (90+theta) in a right angled triangle?
|dw:1350098235823:dw|

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Other answers:

yes but that is 90 - theta? do 90-theta has any relation with 90 + theta ?
\[\cos(x)=\frac{a}{c}=\sin(90-x)=-\sin(x-90)\] \[=\sin(x-90+180)=\sin(x+90)\]
how : -sin(x-90) = sin(x-90+180) ?
third equal sign because sine is odd, fourth because \(\sin(x)=-\sin(x+180)\)
Gotcha now, thanks a lot!
your on the other side of the unit circle |dw:1350098472701:dw|
yw
hey, how you did this step? : \[\large{-\sin(x-90) = sin(x-90+180) }\] ?
@satellite73 did you subtract sin(180) both sides?
i added 180 inside because \(\sin(x)=-\sin(x+180)\)
oh k , got it!

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