3 years ago

True Or False?

Mathematics

1 answer:

SOVA2 [1]3 years ago

8 0

Answer:

nobody knows

Step-by-step explanation:

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Please help me <br><br>If 180°<α<270°, cos⁡ α=−8/17, what is sin -α?

rewona [7]

Starting from the fundamental trigonometric equation, we have

$\cos^2(\alpha)+\sin^2(\alpha)=1 \iff \sin(\alpha)=\pm\sqrt{1-\cos^2(\alpha)}$

Since $180$ , we know that the angle lies in the third quadrant, where both sine and cosine are negative. So, in this specific case, we have

$\sin(\alpha)=-\sqrt{1-\cos^2(\alpha)}$

Plugging the numbers, we have

$\sin(\alpha)=-\sqrt{1-\dfrac{64}{289}}=-\sqrt{\dfrac{225}{289}}=-\dfrac{15}{17}$

Now, just recall that

$\sin(-\alpha)=-\sin(\alpha)$

to deduce

$\sin(-\alpha)=-\sin(\alpha)=-\left(-\dfrac{15}{17}\right)=\dfrac{15}{17}$

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In step 7, you listed three elements commonly listed in charts. what are all of those options? check all that apply. data points

Vanyuwa [196]

Data points
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a legend

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45% of what distance is 135 miles

horrorfan [7]

300 miles. Hope it helps

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In a right triangle, the tangent of an angle is equal to the length of the leg opposite the angle divided by the length of the l

timurjin [86]

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-17=x- 15 one step equation

mina [271]

Answer:

-2=x

Step-by-step explanation:

-17=x-15

Add 15 on both sides

-2=x

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