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Elena L [17]
3 years ago
7

Cos30*cos50+sin30*sin50

Mathematics
1 answer:
lubasha [3.4K]3 years ago
8 0

9514 1404 393

Answer:

  cos(20°)

Step-by-step explanation:

The angle difference formula for cosine is ...

  cos(α -β) = cos(α)cos(β) +sin(α)sin(β)

If we let α = 50° and β = 30° then this matches the given expression:

  cos(50° -30°) = cos(50°)cos(30°) +sin(50°)sin(30°) = cos(20°)

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Hello Love!

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so 15 is our range!

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