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laiz [17]
3 years ago
14

If tanA=1/7 and tanB=1/3 prove that cos2A=sin4B

Mathematics
1 answer:
Tasya [4]3 years ago
3 0

Answer:

{4 |8}. 96. 24

sin4B{3. |9}= ___. = ___ = cos2A

{10|10} 100. 25

{9 |9}

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a carpet store charges 150 to install 12 square yards of carpet how much would it be for 24 square yards
ivanzaharov [21]

Answer:

$300

Step-by-step explanation:

  1. 150/12 to figure out how much to install one yard ($12.50)
  2. 24•12.50=300
4 0
2 years ago
In the United States, we measure milk by the gallon. If we were using the metric system, what metric unit would we use
Lynna [10]

Answer:

The metric unit used for milk is the liter, L.

3 0
2 years ago
How could you use 1/8 measuring cup to measure 1/4 cups of water ​
RSB [31]

Answer:

1/2 cup

Step-by-step explanation:

Two 1/8 cups = 1/4 cup Half of 1/2 cup = 1/4 cup.

8 0
3 years ago
Read 2 more answers
The average marks of the first 10 students are 17 and that of the next 15 students is 18. find the mean of 25 students?
Ray Of Light [21]

Answer:

The mean of 25 students is 17.6

Step-by-step explanation:

The formula of the mean (average) is mean (average) = \frac{S}{N} , where S is the sum of the data, and N is the number of the data

∵ The average marks of the first 10 students are 17

- That means the mean is 17 and the number of students is 10

∴ Average = 17

∴ N = 10

∵ Average = \frac{S}{N}

- Substitute average by 17 and N by 10

∴ 17 = \frac{S}{10}

- Multiply both sides by 10

∴ 170 = S

∴ The sum of the marks of the first 10 students is 170

∵ The average of the next 15 students is 18

∴ Average = 18

∴ N = 15

- Substitute average by 18 and N by 15

∴ 18 = \frac{S}{15}

- Multiply both sides by 15

∴ 270 = S

∴ The sum of the marks of the next 15 students is 270

Now to find the mean of 25 students and the two sums and divide the answer by 25

∵ S = 170 + 270

∴ S = 440

∵ N = 25

∴ Mean = \frac{440}{25}

∴ Mean = 17.6

The mean of 25 students is 17.6

3 0
3 years ago
Csc\theta -cot\theta =\frac{sin}{1+cos\theta }
Inga [223]

Answer:

Step-by-step explanation:

Left Hand Side

Change to sin(theta) and cos(theta)

csc(theta) = 1/sin(theta)

cot(theta) = cos(theta)/sin(theta)

1/sin(theta) - cos(theta)/sin(theta)                   Put over Sin(theta) Common denominator

[1 - cos(theta)] / sin(theta)                                Multiply numerator and denominator by 1 + cos(theta)

(1 - cos(theta)(1 + cos(theta) ) / sin(thata)*(1 + cos(theta))

(1 + cos(theta)(1 - cos(theta)) = 1 - cos^2(theta)

sin^2(theta) / (sin(theta)* ( 1 + cos(theta)

sin(theta) / (1 + cos(theta) )

Right hand Side.

See Above.

4 0
3 years ago
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