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4 years ago

Helpppppppppppppppppppppppppppppppppppppppppppppppp

Mathematics

2 answers:

german4 years ago

7 0

Hello!

You put 7 in for x

7 - 3 = 4

The answer is 4

Hope this helps!

seropon [69]4 years ago

6 0

X - 3
if x = 7 then 7 - 3 = 4

answer
4

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Between 1,400 and 2,100

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3 years ago

Find the surface area of the composite figure

bogdanovich [222]

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268

Step-by-step explanation:

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son4ous [18]

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2 years ago

Please help and also how did u get ur answer

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8 0

3 years ago

Cos(x+y)/cosxcosy+tanxtany=1

adelina 88 [10]

Answer:

See explanation

Step-by-step explanation:

Use formula

$\cos (x+y)=\cos x\cos y-\sin x\sin y$

Substitute it into the first fraction:

$\dfrac{\cos (x+y)}{\cos x\cos y}\\ \\=\dfrac{\cos x\cos y-\sin x\sin y}{\cos x\cos y}\\ \\=\dfrac{\cos x\cos y}{\cos x\cos y}-\dfrac{\sin x\sin y}{\cos x\cos y}\\ \\=1-\dfrac{\sin x}{\cos x}\cdot \dfrac{\sin y}{\cos y}\\ \\=1-\tan x\tany$

Consider the whole expression:

$\dfrac{\cos (x+y)}{\cos x\cos y}+\tan x\tan y\\ \\=1-\tan x \tan y+\tan x\tan y\\ \\=1$

Done!

6 0

3 years ago