Mathematics, 28.05.2020 22:02, bhjbh7ubb

Which sum or difference identity could be used to prove that cos(270º - thata) = -sin thata is an identity?
cos 270° cos 8 – sin 270° sin e
cos 270° cos 0 + sin 270° sin e
O sin 270° cos
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cos 270° sin e
O sin 270° cos 0 + cos 270° sin 0

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Which sum or difference identity could be used to prove that cos(270º - thata) = -sin thata is an id...