1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
zvonat [6]
2 years ago
11

1-cos^2 A / sec^2 A - tan^2 A

Mathematics
1 answer:
tiny-mole [99]2 years ago
6 0
I hope this helps you



✔cos^2A+sin^2A=1


✔1-cos^2A=sin^2A

✔cos2A=cos^2A-sin^2A

✔sin2A=2.sinA.cosA


secA=1/cosA


tgA=sinA/cosA


sin^2A/1/cos^2A-sin^2A/cos^2A


sin^2A.cos^2A/cos2A

2.sin^2A.cos^2A/cos2A


sin2A.2.sin2A/cos2A


tg2A.2.sin2A


You might be interested in
The 759 students in Chad's middle school.44% participate in sports, 29% play in the band,
stellarik [79]

Answer:

A - 220

B -  205

Step-by-step explanation:

29% of 759 is 220.11, round down so it stays 220.

27% of 759 is 204.93 round up so it becomes 205.

bonus:

44% of 759 is 333.96 round up and it becomes 334.

to check your work, add 220, 205, and 334 and its 759. thats how you can be sure its correct.

hope this helps :)

3 0
2 years ago
The diagram shows a right angled triangle use pythagoras theorem to work out length of side ac
Strike441 [17]

Answer:

Step-by-step explanation:

Using Pythagoras theorem,

AC^2 = AB^2 + BC^2

AC^2 = 4^2 + 15^2

AC^2 = 16 + 225

AC^2 = 241

AC = √241

4 0
3 years ago
Find AE<br> Note: Figure is not to scale<br><br> (Graded)
murzikaleks [220]

Answer: i think its 82 but im not sure

Step-by-step explanation:

4 0
3 years ago
A sample of 5 buttons is randomly selected and the following diameters are measured in inches. Give a point estimate for the pop
Helen [10]

Answer:

s^2 = \frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}

But we need to calculate the mean with the following formula:

\bar X = \frac{\sum_{i=1}^n X_I}{n}

And replacing we got:

\bar X = \frac{ 1.04+1.00+1.13+1.08+1.11}{5}= 1.072

And for the sample variance we have:

s^2 = \frac{(1.04-1.072)^2 +(1.00-1.072)^2 +(1.13-1.072)^2 +(1.08-1.072)^2 +(1.11-1.072)^2}{5-1}= 0.00277\ approx 0.003

And thi is the best estimator for the population variance since is an unbiased estimator od the population variance \sigma^2

E(s^2) = \sigma^2

Step-by-step explanation:

For this case we have the following data:

1.04,1.00,1.13,1.08,1.11

And in order to estimate the population variance we can use the sample variance formula:

s^2 = \frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}

But we need to calculate the mean with the following formula:

\bar X = \frac{\sum_{i=1}^n X_I}{n}

And replacing we got:

\bar X = \frac{ 1.04+1.00+1.13+1.08+1.11}{5}= 1.072

And for the sample variance we have:

s^2 = \frac{(1.04-1.072)^2 +(1.00-1.072)^2 +(1.13-1.072)^2 +(1.08-1.072)^2 +(1.11-1.072)^2}{5-1}= 0.00277\ approx 0.003

And thi is the best estimator for the population variance since is an unbiased estimator od the population variance \sigma^2

E(s^2) = \sigma^2

3 0
3 years ago
Find the area of the shaded figure in the diagram below. Use 3.14 for π and round your answer to the nearest hundredth.
kirill [66]

Answer:

D

Step-by-step explanation:

diameter of 1 circle = 21.3/3= 7.1

radius of 1 circle= 7.1/3=3.55

area of 1 circle =πr^2=3.14× (3.55)^2=39.57

area of 3 circle= 39.57×3=118.72

therefore,area of shaded portion= area of 3 circle =118.72

7 0
2 years ago
Other questions:
  • Which points represent a solution to the system graphed below? Select all that apply.
    6·1 answer
  • GUESS!
    5·1 answer
  • What does nPn represent?
    15·1 answer
  • To which set or sets below does the number -1/2 belong
    12·1 answer
  • Find (f•g) (-1)<br> Let f(x) =-2x-1 and g(x) =x^2 -1
    5·1 answer
  • The brown recluse spider has 6 eyes. For this type of spider, what is the ratio of eyes to spiders?
    5·2 answers
  • Simplify the following expression:<br> 6 + 3 - 2
    11·2 answers
  • Solve diiis! <br> 2-(y+2)=3y<br> PPLLSS AANNDD TTHHXX!!
    13·2 answers
  • What is the volume of the figure? Enter the answer in the box.
    12·1 answer
  • Using a loan calculator, find the total cost to repay a two month long short-term loan with a principal of $750 and an interest
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!