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
QveST [7]
3 years ago
14

Solve this pleaseplease​

Mathematics
1 answer:
tamaranim1 [39]3 years ago
6 0

Answer:

Step-by-step explanation:

cos(2a) = cos^2(a) - sin^2(a)

cos(2a) = 2cos^(a) - 1

cos(2a) = 11/25

11/25 = 2 cos^(a) - 1             Add 1 to both sides

1 + 11/25 = 2 cos^2

25/25 + 11/25 = 2 cos^2(a)

36/25 = 2 cos^2 (a)            Divide by 2

36/50 = cos^2 (a)               Take the square root of both sides.

6/5*sqrt(2) = cos(a)            

You might be interested in
What is the equation of the line that is perpendicular to line a and passes through (2,7).
Aleonysh [2.5K]

Answer:

y = x + 5

Step-by-step explanation:

Slope = - 1

Slope of the perpendicular line = 1

Point (2,7)

(b) y-intercept= 7 - (1)(2)

= 5

7 0
2 years ago
If the base of a triangle is represented by 2x+5 and the height is represented by 4x which expression represents the area of the
madreJ [45]

Answer:

The answer is D

Step-by-step explanation:

You use base times height

1/2bh

=1/2(2x+5)(4x)

5 0
2 years ago
Please help me with this
masha68 [24]

Answer:

12

Step-by-step explanation:

10x-11+3x-2+3x+1=180

16x-12=180

16x=192

x=12

7 0
2 years ago
Read 2 more answers
How would you label this angle?<br><br> A) ∠C<br><br> B) ∠B<br><br> C)∠A<br><br> D) none of these
Elina [12.6K]

Answer:

B: Acute

Please make me brainiest

7 0
2 years ago
Read 2 more answers
Help please me ! 10 pts and
andre [41]
The answer is -6
So you need to drop the word sum on -6
6 0
3 years ago
Read 2 more answers
Other questions:
  • A person on a moving sidewalk travels 20 feet in 5 seconds. the moving sidewalk has a length of 80 feet. how long will it take t
    15·1 answer
  • The sum of two numbers is 79. one number is 37 more than the other. find the number
    8·2 answers
  • Find the lengths of the sides of the triangle PQR. Is it a right triangle? Is it an isosceles triangle? P(2, -1, 0), Q(4, 1, 1),
    14·1 answer
  • A graph in the form y = ax2 will have a vertex at __
    13·2 answers
  • Patricia brought $45 to the county fair, her friend Claire brings $10 more than Patricia . Write an model and expression to repr
    8·1 answer
  • Pls help me find the slope <br><br> Y(-5,0), Z(-2,-4)
    9·2 answers
  • For the data set below identify the interquartile range of the data.
    8·2 answers
  • Area of rectangle is 128, the ratio of length to width is 2:1 what is the width
    8·1 answer
  • Oxygen flows through one tube into a liter flask filled with air, and the mixture of oxygen and air (considered well stirred) es
    5·1 answer
  • Through Viking Brokerage, Erin purchased $23,510 worth of stock and paid
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!