Question: how to use both half angle identity and sum difference identity to find the value of cos 165 how to use both half-angle identity and

how to use both half-angle identity and sum/difference identity to find the
value of cos(1650)

how to use both half angle identity and sum difference identity to find the value of cos 165

how to use both half-angle identity and sum/difference identity to find the value of cos(1650)

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