4 years ago

Help me plz i need help

Mathematics

1 answer:

labwork [276]4 years ago

6 0

Answer:

91677.9415 milliliters

Step-by-step explanation:

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

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Answer:

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Step-by-step explanation:

Use formula

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

Consider the whole expression:

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

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