Find the exact value ofcos(α+β)under the given conditions.   sinα=15/17, 0<α<π/2​; cosβ=20/29,0<β<π/2

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Q: evaluate using the appropriate method or combination of methods.

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A: Hello. Since your question has multiple parts, we will solve the first part for you. If you want…

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A: We know thatcosα+β=cosα cosβ-sinα sinβ

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A: "Since you have asked multiple questions, we will solve the first question for you. If you want any…