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polet [3.4K]
3 years ago
9

Solve the equation for solutions in the interval [0, 2 π). Use algebraic methods and give exact values. Support your solution gr

aphically. cos2x = 0

Mathematics
2 answers:
Anvisha [2.4K]3 years ago
7 0

Answer:

Step-by-step explanation:

● cos 2x = 0

We khow that Pi/2 equals 0.

So

● 2x = Pi/2 or 2x= -Pi/2

Then:

● x = Pi/4 or x = -Pi/2

So the solutions are:

● x = Pi/4 + 2×k×Pi

● or x = -Pi/4 + 2×k×Pi

Where k is an integer

The picture below has a graphical solution

● Pi/4 is approximatively 0.785 and -Pi/4 is approximatively -0.785

● the output of both Pi/4 and -Pi/4 is 0

So our answer was righr

SSSSS [86.1K]3 years ago
4 0

Answer:

45° or 135°

Step-by-step explanation:

Cos 2x = 0

2x = cos^-1 0

2x = 90° or 270°

x= 45° or 135°

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The dual bar chart shows the hair colour of boys and girls in a year group. What fraction of the students are girls? Give your a
Tems11 [23]

Answer:

5/11

Step-by-step explanation:

Black= 22 b+17 g

Brown= 4 b +18 g

Blonde= 25 b+ 10 g

Red= 21 b+ 15 g

Total number= 22+17+4+18+25+10+21+15= 132

Number of girls= 17+18+10+15= 60

Girls are 60/132= 2 × 2 × 3 × 5/ 2 × 2 × 3 × 11= 5/11 of all students

7 0
3 years ago
How do you find the perimeter
lukranit [14]

The perimeter is 86 m.

When you add the 18 with the 11, you get the length of the bottom side, which is 29. When you add the nine and the 6, you get the length of the left side, which is 15. Now add everything together.

18 + 6 + 11 + 9 + 29 + 15 = 86 m

Hope I helped. Good luck!! : )

4 0
3 years ago
I need a answer please
andrew-mc [135]

65^2 = 39^2 + b^2

4225 = 1521 + b^2

b^2 = 4225 - 1521

b^2 = 2704

b = √2704

b = 52 inches

4 0
2 years ago
How would I do this and what is the answer
NemiM [27]

Answer:

7,8,9

Step-by-step explanation:

You just need the other ones together to be greater than 13

Example: 7+7=14,  it is greater.

7 0
3 years ago
The product of sin 30° and sin 60° is same as the product blank of
hjlf

Answer:

A. & A.

Step-by-step explanation:

sin(x) = cos(90-x)

sin(30) = cos(90-30) = 60

sin(60) = cos(90-60) = 30

5 0
3 years ago
Read 2 more answers
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