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Margaret [11]
3 years ago
14

Find the exact value of the expression cos10°cos20°-sin10°sin20° Please Help

Mathematics
1 answer:
Svet_ta [14]3 years ago
5 0
Cos10 cos20 -sin10 sin20 = cos(10+20) = cos30 = √3/2
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Step-by-step explanation:

To solve this, we are going to make an age table:

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Filling the in the Age Now column comes from the first sentence. If Elliot is 2 times Tanya's age and we don't know Tanya's age, then Tanya's age is x and Elliot's age is 2x:

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Filling in the Age 10 years ago column simply requires that we take their ages in the Age Now column and subtract 10 from each age:

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