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
NeX [460]
3 years ago
14

Write the expression as either the sine, cosine, or tangent of a single angle.

Mathematics
2 answers:
dlinn [17]3 years ago
7 0
The answer is cos(2pi/35)
lana66690 [7]3 years ago
4 0
The expression is:
cos (π / 5) cos (π/7) + sin (π/5) sin(π/7)

This expression can be reduced into a trigonometric function with one angle if we make use of the trigonometric identities. The appropriate identity is:
cos (A - B) = cos A cos B + sin A sin B

If we let
A = π / 5
B = π / 7

Therefore,
cos (π / 5) cos (π/7) + sin (π/5) sin(π/7) = cos (π/5 - π/7) = cos (2π/35)

You might be interested in
Explain a thought process you might use when trying to find the additive or multiplicative inverse of a number or expression. ..
gizmo_the_mogwai [7]
Definition of additive inverse.- If two numbers are added together and the sum is zero, they are the additive inverse of each other. 


<span>......................................... IF A + B = 0 , they are the additive inverse of each other. 
</span>

<span>Multiplicative Inverse.- If two numbers are multiplied together and the product is one. They are the multiplicative inverse of each other, also called reciprocal. </span>

<span>......................................... A.B = 1 , they are the multiplicative inverse of each other. 
</span>

<span>Example of: </span>

<span>Additive inverses :................ 5 + ( - 5 ) = 0 </span>

<span>Multiplicative inverses...........5 x 1/5 = 1 </span>
3 0
3 years ago
3. Find two possible lengths for CD if C, D, and E
Kaylis [27]

Given :

C, D, and E  are col-linear, CE = 15.8 centimetres, and DE=  3.5 centimetres.

To Find :

Two possible lengths for CD.

Solution :

Their are two cases :

1)

When D is in between C and E .

.                   .           .

C                  D          E

Here, CD = CE - DE

CD = 15.8 - 3.5 cm

CD = 12.3 cm

2)

When E is in between D and C.

.       .                .

D      E              C

Here, CD = CE + DE

CD = 15.8 + 3.5 cm

CD = 19.3 cm

Hence, this is the required solution.

3 0
3 years ago
What is the value of x in the equation -2/3x + 9 = 4/3x - 3 ?​
Ainat [17]

Answer:

x = 1/6

Step-by-step explanation:

hope it helps.

x= 1/6

6 0
3 years ago
Read 2 more answers
The radius of a small ball is around 4.89796 cm. the radius of a basketball is about 2.45 times larger. what is the ratio of the
expeople1 [14]
Formula for surface area of a sphere of radius r is A = 4pi*r^2.

The same formula, for the case where the radius is 2.45 times greater, comes out to A = 4pi*[2.45r]^2.

Just find the ratio of

4pi*r^2 to 4pi*[2.45r]^2.  It is 1/6.


6 0
3 years ago
The cost to rent a video game for 3 days was $10. It costs the same amount each day.
Norma-Jean [14]
¢30 every day because 10divided by 3 is .3
6 0
3 years ago
Other questions:
  • Solve the equation. y + 3 = –y + 9
    12·2 answers
  • Y=3x+2 is the equation of a straight line graph. Where does it cross the y-axis?
    11·1 answer
  • What is the length of a diagonal of a rectangular picture whose sides are 15 inches by 17 inches? Round to the nearest tenth of
    9·1 answer
  • Which inequality statement describes the relationships between the sides of the triangle?
    14·2 answers
  • Factor 20x2 + 50x + 20.
    10·1 answer
  • MATH HELP PLEASE 5 AND 6
    10·1 answer
  • 3(x+2)^2=48 with word steps
    5·2 answers
  • PLEASE HELP ASAP
    6·1 answer
  • 4&lt;-2x+3&lt;9<br> Graph the inequality
    13·1 answer
  • Trey made a scale drawing of a microchip using s scale of 2 inches to 1 centimeter. His drawing was an enlargement that depicted
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!