Question: Please use the attached image (10 points) Write a sum formula for cos (b+ c+d ) where b, c, and d are angles. Hint: Expand

Please use the attached image

(10 points) Write a sum formula for cos (b+ c+d ) where b, c, and d are angles. Hint: Expand using the sum and difference formulas. Show all steps. Your answer should start with: cos (b) cos (c) cos(d )

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