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
prisoha [69]
2 years ago
5

3 Prove thatcos130°+cos 110+ cos10=0​

Mathematics
1 answer:
Evgesh-ka [11]2 years ago
5 0

We know, cos A + cos B = 2cos(C+D)/2 × cos(C - D)/2

So,

cos 130 + cos 110 + cos 10

cos 130 + 2cos (110+10)/2 × cos( 110-10)/2

cos 130 + 2cos 60 × cos 50

cos ( 180 - 50 ) + 2cos60 cos 50

We know, cos ( 180 - A ) = -cos A

2cos 60 cos 50 - cos 50

Also, cos 60 = 0.5

2×0.5 cos 50 - cos50

cos 50 - cos 50

0  = RHS.

Hence proved

You might be interested in
22. A rectangular container, whose base is a square
Pie

Answer:

the will be volume is 6cm

7 0
3 years ago
Combine like terms - y + 9z - 16y - 25z + 4
alexandr402 [8]

- 17y - 16z + 4

Step-by-step explanation:

1) Collect like terms.

( - y - 16y) + (9z - 25z) + 4

2) Simplify.

- 17y - 16z + 4

So, therefor, the answer is -17y - 16z + 4.

8 0
3 years ago
8 is greater than w, and w is greater than 3
topjm [15]

Answer:

W is either 4, 5, 6, or 7.

Step-by-step explanation:

7 0
2 years ago
Which statement is correct about relations and functions?
vitfil [10]
1. all functions are relations.

2.
-7 + 3(-12) ÷ (-3)
-7 - 36 ÷ -3
-7 - (-12)
-7 + 12
5  

3.
 f(n) = n² - n    f(-4)
f(-4) = -4² - (-4)
f(-4) = 16 - (-4)
f(-4) = 16 + 4
f(-4) = 20

hope this helped, God bless!
6 0
2 years ago
the sides of a triangular birdcage are consecutive intergers if tge perimeter is 114 cm what is tge length of each side
alexandr402 [8]
Let:
x = first consecutive integer (or first side of △)
x + 1 = second consecutive integer (or second side of △)
x + 2 = third consecutive integer (or third side of △)

The formula for a perimeter of △ is simply the addition of three sides (or length). Since the given perimeter is 114 cm,
x + x+1 + x+2 = 114
3x + 3 = 114
3x = 114 - 3
3x = 111
x = 111 /3 = 37 cm
The three sides are 37 cm, 38 cm, and 39 cm.
5 0
2 years ago
Other questions:
  • Two separate single-factor anovas provide exactly the same information that is obtained from a two-factor analysis of variance.
    15·1 answer
  • A worker at an orchard measures the mass of different numbers of apples. The scatter plot below shows the relationship between t
    8·1 answer
  • Consider an optical communication system that transmits a symbol "1" by turning a laser onfor 200 nanoseconds, and a "0" by turn
    5·1 answer
  • The Cubs have won 44 baseball games and have lost 65 games. They have 53 games remaining. At least how many of the remaining 53
    12·1 answer
  • Please help me please
    5·1 answer
  • JUST THE FIRST ONE EASY PLS ASAP
    15·1 answer
  • Order the numbers from least to greatest.<br><br> -1 4/5, 3/2, |- 7/4|, |-2.2|
    10·1 answer
  • State if the three numbers can be the lengths of the sides of a triangle 7, 19, 9​
    5·1 answer
  • Need answers as soon as possible, Thank you!
    10·2 answers
  • Can someone explain to me how to remove all the perfect squares ? I’m kind of confused and my teacher is unavailable to help and
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!