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Dominik [7]
3 years ago
6

Tìm giá trị lớn nhất giá trị nhỏ nhất Cos(x+π/3)+ cos(x-π/3)

Mathematics
1 answer:
Elina [12.6K]3 years ago
6 0

Answer:

GTLN : 1  GTNN: -1

Step-by-step explanation:

Ta có:

y=cos(x+\frac{\pi }{3} ) + cos(x-\frac{\pi }{3} ) \\  = 2.cosx.cos\frac{\pi }{3}  \\  = cosx

mà -1\leq cosx \leq 1

Nên Max y=1  , x ∈ R

       Min y = -1, x ∈ R

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Answer:

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Step-by-step explanation:

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Using the values from above, we can set up the equation as:

400 = 25m + 10b

or

25m + 10b = 400

This equation represents the number of lawns they can mow, m, and hours they can babysit, b, to earn $400.

Hope this helps have a good day

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