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mafiozo [28]
3 years ago
15

Which quantity does this number line represent?

Mathematics
1 answer:
Paladinen [302]3 years ago
6 0
D BECAUSE LOOK AT THE TIME LINE
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Cos(-170°) = _____<br><br> -cos10°<br> cos10°<br> cos(-10°)
ikadub [295]

<em>The right answer for:</em>

<em>cos(-170°) = _____</em>

<em>is:</em>

<em>-cos10°</em>

<h2>Explanation:</h2>

The cosine function is an even function, which means that for every point (x,y) on the graph of y=cos(x) then the point (-x,y) also lies on the graph of the function. In other words, we can write:

cos(-170^{\circ})=cos(170^{\circ})

But:

170^{\circ}=180^{\circ}-10^{\circ}

So:

cos(170^{\circ})=cos(180^{\circ}-10^{\circ})

By property:

cos(a-b)=cosacosb+sinasinb \\ \\ a=180^{\circ} \\ \\ b=10^{\circ} \\ \\ cos(170^{\circ} )=cos(180^{\circ} -10^{\circ})=cos180^{\circ} cos10^{\circ} +sin180^{\circ} sin10^{\circ} \\ \\  cos(170^{\circ})=-cos(10^{\circ})+0 \\ \\ \boxed{cos(170^{\circ})=-cos(10^{\circ})}

<h2>Learn more:</h2>

Trigonometric functions: brainly.com/question/2680050

#LearnWithBrainly

4 0
3 years ago
Help me please I dont understand
Vaselesa [24]

Answer:

42°

Step-by-step explanation:

This is right triangle and sum of 2 angles is 90°:

y+48°=90°

so y= 90°- 48°= 42°

4 0
3 years ago
Please Help on Math question...
Eddi Din [679]

Answer:

Yes

Step-by-step explanation:

Because 9, 12, and 15 are Pythagorean triples

7 0
3 years ago
Solve the equation using square roots.<br> 2(x + 1)2 - 7 = 25<br> solution: x=
denpristay [2]

x=7

I'm sorry if I'm wrong

8 0
3 years ago
anne marie needs to rent a car for 9 days to take on vacation. The cost of renting a car is $66 per day, $15.99 for insurance, a
rusak2 [61]
First of all you would multiply 9(days) by $66(per day) which would be $594! The, you would add $15.99 for insurance which would be $609.99, and then also add 42.50 to fill up with gas. So your answer would be $652.49. Hope I helped
5 0
3 years ago
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