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
aleksklad [387]
3 years ago
15

Simplify the expression using the appropriate identities. (Do not use calculator)

Mathematics
1 answer:
bezimeni [28]3 years ago
6 0

Answer:

sin -1 degrees.

Step-by-step explanation:

sin (A - B) = sin A cos B - cos A sin B

Therefore  sin 9° cos 10°- cos 9º sin 10° = sin (9 - 10)

= sin -1 degrees.

You might be interested in
What is measure of angle R?
Aleks [24]
The given triangle is a right triangle.
The tangent of an angle of right triangle is obtained by dividing the opposite side of the angle with the adjacent side of the angle.
The opposite side of angle R is 5 cm and the adjacent side of angle R is 12 cm.

tan R = 5 / 12 = 0.4167
R = arctan (0.4167) = 22.6 degrees.
4 0
2 years ago
Need help on #6 step by step I'm so confused how this works I always get stuck
inna [77]
To find the variable x, set the two outside equations equal to each other because all sides are equal
x+13=3x+3
13=2x+3
10=2x
x=5

then to find h, you set the equation equal to 90 because that's how many degrees it is
2h-45=90
2h=135
h=67.5
6 0
3 years ago
A+b=77,a-b=13 care sun nr
STALIN [3.7K]
It's a simultaneous equation:
Steps:
1.Number the equations..

a+b=77 -1
a-b=13 -2

2. Choose what variable you want to use. In this case I would use the "b". Since the signs in front of the "b's" are different, add the two equations together

a + b = 77
+ + +
a (-b) = 13

Which gives;
2a = 90

Then solve to find a:
2a=90
a= 90/2
a=45

3.Then plug the "a" value into any of the original equations to find the "b" value. I would use equation 1 since the all the variables are positive.

a + b = 77
(45) + b = 77
b=77-45
b=32

4.Solution

a=45
b=32
3 0
3 years ago
Jill had $125 to spend at the mall. She spent 27% of that money on a pair of shoes. Jill spent $___ on the shoes.
zaharov [31]
You need to find what 27% of $125 is.
To find a percent of a number, multiply the percent by the number.

27% of $125 =

= 27% * $125

= 0.27 * $125

= $33.75

Answer: Jill spent $33.75 on the shoes.
4 0
3 years ago
Can the sides of a triangle have lengths 2, 13, and 14?
ohaa [14]

Answer:

Yes

Step-by-step explanation:

The larger side is smaller than the other sides combined

(2 + 13) > 14

Hope this helps

7 0
2 years ago
Other questions:
  • Find the point on the curve y = x 2 closest to the point (3, 4).
    5·1 answer
  • |x+2|=3 solve and check
    6·1 answer
  • the big bag is 16 ounces and costs $4.32. The medium is 20 ounces and costs $2.60. The small bag is 6 ounces and costs $1.80
    11·1 answer
  • What is 2/24 simplify
    15·2 answers
  • A technician charges $25 per hour plus $50 for a
    5·1 answer
  • What 1,055 to the nearest tenth
    13·2 answers
  • Plz help picture included<br> Geometery
    14·2 answers
  • This is an isosceles trapezoid z=
    10·2 answers
  • In a certain​ chemical, the ratio of zinc to copper is 3 to 11. A jar of the chemical contains 264 grams of copper. How many gra
    12·2 answers
  • 2. (4a - 8b + 12c) (-5/2) Simply using distributive property and combining like terms​
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!