Mathematics, 15.07.2021 14:00 misspicafunpoke

Find cosθ+cos3θ+cos5θ+cos7θ by using the Sum-to-Product Formula. Please also show your work as well. Thanks!

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Find cosθ+cos3θ+cos5θ+cos7θ by using the Sum-to-Product Formula. Please also show your work as well...