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
Akimi4 [234]
3 years ago
10

If tan²A = 1+ 2tan²BShow: COS2B = 1+2 cos2A​

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

Answer:

Step-by-step explanation:

hello :

here is this idea :  

tanA= sinA/cosA          tanB= sinB/cosB

cos²A+sin²A =1              cos²B+sin²B =1  

cos²A-sin²A=cos2A            cos²B-sin²B=cos2B

You might be interested in
No links, I just need an explanation on how to do this, like step by step because I don't understand. T-T
Goryan [66]

Answer:

a. Jared and Ali

Step-by-step explanation:

b. Molly make mistake when he/she divide all equation by 4 but left the 8x remain 8x, it should be 2x.

Mark make mistake in changing the sign whitout changing side/ passing trough equal sign. FYI, + can be - and also - can be + if they move to the other side

i.e.

2 + 3 = 5

2 = 5 - 3

7 0
2 years ago
Find the area of a regular octagon with side lengths of 17.2 m and an apothem length of 20.8 m.
jek_recluse [69]

Answer:

Pentagon a = 4.9 in. s = 7.1 in. /l ;/ >cvr'-. ~ j-?.1· '19~~. 5) Octagon a = 20.8 m s= 17.2m. ,4 ~;.>a-rt. ::: i, 17. z • t~f "g. ~ :::::, l'/?1 ,0 nt z, ... What is the length of the apothem to the nearest whole number

Step-by-step explanation:

Pentagon a = 4.9 in. s = 7.1 in. /l ;/ >cvr'-. ~ j-?.1· '19~~. 5) Octagon a = 20.8 m s= 17.2m. ,4 ~;.>a-rt. ::: i, 17. z • t~f "g. ~ :::::, l'/?1 ,0 nt z, ... What is the length of the apothem to the nearest whole number

5 0
3 years ago
It’s geometry I have a triangle left side is just a c right side is 80cm and the bottom is 18cm but there’s a right angle in the
Monica [59]

Answer:

i think its 10cm

Step-by-step explanation: brainlyest plz :)

90+80=170

180-170=10

7 0
3 years ago
Explain why y +1 = 1.2(x + 2) and y- 5 = 1.2(x – 3) represent the same line, despite having
Shtirlitz [24]

Answer:

They have the same slope

Step-by-step explanation:

The standard equation of a line in point-slope form is expressed as;

y-y0 = m(x-x0)

We can see that both equations given are written in this form with a slope of 1.2. For two lines to be equal, they must have the same slope no matter the point on the lines. Hence the two equations are equal since they have different slopes.

5 0
2 years ago
A store sells 168 tapes each week. How many tapes does it sell in 24 weeks?
OLga [1]

Answer: <em>4032</em>

Step-by-step explanation:

<em>Take 168 and multiply by 24</em>

<em>168x24</em>

<em>you will get </em>

<em>4032 tapes in 24 weeks</em>

3 0
2 years ago
Other questions:
  • If y varies directly with x and y=30 when x=-10, find the value of x when y=4
    12·1 answer
  • What is a chemical change also known as?
    15·2 answers
  • Find the maximum or minimum value of the parabola.<br> y = –2x^2 – 16x + 20
    10·2 answers
  • Please help me solve this: 6 1/3 + k + 3 5/6 + 5 1/2 = 26 1/6
    5·2 answers
  • Identify the graph that correctly represents the inequality |x + 1| + 2 &gt;  5.
    10·2 answers
  • Which expression is equivalent to 10x2y+25x
    7·1 answer
  • Gregg has just signed up to have money automatically transferred from his checking account to his savings account each month. He
    14·1 answer
  • Find the inequality represented by the graph.<br> Can someone please help me!!!!!!
    13·1 answer
  • Select all the sets of three side lengths that will make a triangle.
    15·2 answers
  • Please help fast!!!
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!