3 years ago

7x +2x -1 equals what

Mathematics

1 answer:

olchik [2.2K]3 years ago

8 0

Well 7x+2x=9x and 9x - 1 = 9x - 1
so the answer should be 9x-1

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miskamm [114]

Answer:

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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3 years ago

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VikaD [51]

Not sure why such an old question is showing up on my feed...

Anyway, let $x=\tan^{-1}\dfrac43$ and $y=\sin^{-1}\dfrac35$ . Then we want to find the exact value of $\cos(x-y)$ .

Use the angle difference identity:

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

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So,

$\cos\left(\tan^{-1}\dfrac43-\sin^{-1}\dfrac35\right)=\dfrac35\cdot\dfrac45+\dfrac45\cdot\dfrac35=\dfrac{24}{25}$

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Step-by-step explanation:

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