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Zepler [3.9K]
2 years ago
15

A building has an entry the shape of a parabolic arch 22 ft high and 28 ft wide at the base, as shown below.

Mathematics
1 answer:
Ivenika [448]2 years ago
5 0
The parabola is at Max of 22
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Tina will be able to sell 24 beignets

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Missing: 19.96 ÷ ‎| Must include: 19.96 ÷

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Verify the identity: cos4u = cos^2 (2u) - sin^2 (2u)
Svet_ta [14]
Use the trigonometric identity:

\cos { \left( A+B \right) = } \cos { \left( A \right)  } \cos { \left( B \right)  } -\sin { \left( A \right) \sin { \left( B \right)  }  }

Now, if A=2u and B=2u:

\cos { \left( 2u+2u \right)  } \\ \\ =\cos { \left( 4u \right)  } \\ \\ =\cos { \left( 2u \right)  } \cos { \left( 2u \right)  } -\sin { \left( 2u \right) \sin { \left( 2u \right)  }  } \\ \\ =\cos ^{ 2 }{ \left( 2u \right) -\sin ^{ 2 }{ \left( 2u \right)  }  }
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