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Is it right to say cos(60^@ - 30^@) = co...

Is it right to say `cos(60^@ - 30^@)` = `cos 60^@`. `cos 30^@ + sin 60^@. Sin 30^@`?

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Is it true to say that cos(60^@ + 30^@) = cos 60^@ cos 30^@ + sin 60^@ sin 30^@

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