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vredina [299]
2 years ago
10

If cos28 = x/4, find x(3sf)

Mathematics
1 answer:
FinnZ [79.3K]2 years ago
3 0
Cos28 = x/4 so to get rid of the fraction , multiply each side by 4 so it'll be
4cos28 = x
x = 3.531790371
Hope this helps=)
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Answer:

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f (x,y,z) = xy + 2xz + 2yz ------  (1)

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f (x,y,z) = xy + 2x(\frac{16384}{xy} ) + 2y(\frac{16384}{xy} )

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f_{x}  = y - \frac{32768}{x^{2} }

f_{y}  = x - \frac{32768}{y^{2} }

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y - \frac{32768}{x^{2} } = 0

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By solving equation (2) & (3) we get

x^{3} = 32768

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y = 32768 \ x^{-2}

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z =  \frac{16384}{(34)(31)}

Z = 15.54 cm

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x = 31 cm ,  y = 34 cm & Z = 15.54 cm

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