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kati45 [8]
3 years ago
12

What is the exact value of sin -840

Mathematics
1 answer:
dsp733 years ago
7 0
First subtract  2 revolutions from the - 840 :-    (- (840-720)  = -120

This gives  sin -120  which is in the 3rd quadrant of the unit circle

sin -120  =  - sin 60  = - sqrt3/2
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Answer:

A. 7 pounds

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Step-by-step explanation:

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8 0
2 years ago
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Find the exact value of cos(arcsin(1/4)). For full credit, explain your reasoning.
Westkost [7]
First way
arcsin(1/4) means that 1/4 sin of the angle.

sin(α)=1/4
sin²α+cos²α=1
(1/4)²+cos²α=1
cos²α=1-1/16 =15/16
cosα=+/-(√15)/4

<span>Second way
</span>
sin(α)=1/4 =opposite leg/hipotenuse
cos(α)=adjacent leg/hypothenuse
adjacent leg =√(hypotenuse²- Opposite²)=√(16-1)=√15
cosα=+/-√15/4

For one value of sinα, possible 2 values of cosα.

5 0
2 years ago
If f(x) = 2x2 + 2 and g(x) = x2 - 1, find (f - g)(x)I
erastovalidia [21]

9514 1404 393

Answer:

  C. x^2 + 3

Step-by-step explanation:

Substitute for f(x) and g(x) and simplify.

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4 0
2 years ago
I need to know what 2 numbers go in here to equal 20​
mr Goodwill [35]

Answer:

4 and 2

Step-by-step explanation:

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3 0
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Brrunno [24]

Answer:

1/3 and 1.5

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1,2,3,4,5,6,7,8,9,10,11,12,13,14,15

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5/15 is the probability for a multiple of 3 which can be simplified to 1/3

3/15 is the probability for a multiple of 4 which can be simplified to 1/5

Hope this Helps!

5 0
3 years ago
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