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TiliK225 [7]
2 years ago
10

cos (x/2) = -sqrt2/2 in (0,360) looking for two values ?? Can someone please help me I can’t seem to figure out how to solve thi

s problem, I’m looking at other examples but I’m still confused please help
Mathematics
1 answer:
ValentinkaMS [17]2 years ago
8 0

Answer:

135° and 225°

Step-by-step explanation:

basically you want to find the value of x between 0 and 360 in this equation

cos x/2 = -(√2)/2

assume x/2 as n, so

cos n = -(√2)/2

n = 45°

then remember the quadrant system

0-90 1st quadrant, all is POSITIVE

90-180 2nd quadrant, only SIN has positive value

180 - 270 3rd quadrant, only TAN has positive value

270 -360 4th quadrant, only COS positive here.

so if you try to find negative value look into 2nd and 3rd quadrant that related 45° to x-axis (0°or 180°)

so the value of x is

180 - 45 = 135° (2nd quadrant) and

180 + 45° = 225° (3rd quadrant)

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Plz help me tha ks so myxhhh​
Mama L [17]
The forth one is correct hope this helps :)))
3 0
3 years ago
Which is one is correct?
SVEN [57.7K]

Answer:

the 3rd number line

Step-by-step explanation:

first of all, we know That the line starts from zero.

the inequation is n>0

the circle inside should be the hallow one because it's "greater" not greater than or equal to.

n>0 means that n is greater than 0.

in the number line, ( the 3rd one)  n  is going away from 0. it's going greater than 0.

that is why this is the correct answer.

I hope this clarified any confusion.

3 0
3 years ago
Read 2 more answers
PLS! ANSWER ASAP!!! 45 POINTS!
barxatty [35]

Answer:

3. is 5

4. is 18

5. is 8

Step-by-step explanation:

i did try so forgive me if im wrong

4 0
3 years ago
Help me please thanks
Brut [27]
Forget about the negative sign. First you have to find a least common denominator. This would be 63. Since we had to multiply 9 by 7 to get 63 we have to multiply the numerator (4) by 7. This gives us a new fraction of 36/63. Since we ha e to multiply 21 by 3 to get 63 we have to multiply 19 by 3. This gives us 57. So now we have 36/63 and 57/63. Then we add the negative sign back in making 57/63 -57/63. Now we add them together. Because one has a negative sign and one is positive the number has to be closer to zero. So the answer is -21/63.
3 0
3 years ago
What is the area of a parallelogram that has the length of 3.5cm and the height of 2.3cm?
lianna [129]
Area of parallelogram = bh

3.5 x 2.3
= 8.05cm
6 0
3 years ago
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