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
Inga [223]
4 years ago
8

Cos(3x) = cos^2x - 3sin^2x cosx

Mathematics
1 answer:
EleoNora [17]4 years ago
8 0
\cos3x=\cos(2x+x)=\cos2x\cos x-\sin2x\sin x
=(\cos^2x-\sin^2x)\cos x-2\sin^2x\cos x
=\cos^3x-3\sin^2x\cos x
You might be interested in
...................................................................
Genrish500 [490]

Answer:

12 cm

Step-by-step explanation:

The Pythagorean Theorem is as follows:

a^{2} +b^{2} =c^{2}

A and B represent the side lengths (legs) and C represents the hypotenuse.

The length of one leg equals 5cm. (This can be represented by either a or b)

The hypotenuse equals 13 cm.

Plug these into the equation from above:

a^{2} + (5^{2}) = (13^{2})

Solve for the other leg:

   a^{2} + 25 = 169                          Square what's in the parentheses from above

a^{2} = 144\\                                  Subtract 25 from 169

\sqrt{a^{2} } = \sqrt{144}                            Square root both sides

a = 12 cm                        

Thus, the length of the other leg is 12 cm.

Let's check our answer:

12^{2} +5^{2} =13^{2}                        Square everything

144 + 25 = 169                      Add

169 = 169

Because both sides are equal it means that 12 cm is the correct answer.

Hope this helps!!

3 0
2 years ago
Whats 2+2tgggggvvvvvvv
amid [387]

Answer:

is this a joke? xd. 2+2=4.

4 0
4 years ago
Read 2 more answers
Jackson has three cartons of gumballs. There are 100 boxes in each carton. There are 100 gumballs in each box
lilavasa [31]

Answer:

3. 10000

Step-by-step explanation:

Given the following :

Number of gumball cartons = 3

Number of boxes per carton = 100

Number of gumballs per box = 100

The number of gumballs can be expressed in the form : (a. 10) ; where ; a = prime number ; b = whole number

Values of a and b?

Total number of gumballs :

Number of carton × number of boxes per carton × number of gumballs per box

3 × 100 × 100

Hence, writing the expression in the form: a. 10

a. 10 = 3 × 10000

4 0
3 years ago
1) the point where the x abd y axis meet 2) if m< A + m<D = 90, then <A and D are ____ angles 3) an angle formed by opp
Brums [2.3K]

1. The point where x and y axis meet is the intersect, origin of the coordinate system (0,0)

2. m<A and m<D = 90 then <A and D are  complementary angles

3. 180 angle or linear rays

4. Obtuse angle measure more than 90

5. Segment of equal lengths are congruent segments

6. Lines that meet at a 90 angle are perpendicular

8 0
3 years ago
Which mathematical property is demonstrated?
Orlov [11]
Commutative property of multiplication is shown above. This is because no matter how you put them, the answer will still be 140. 
5 0
3 years ago
Other questions:
  • Which probability method involves estimating a probability by using personal judgment or an educated​ guess?
    7·1 answer
  • lou has 1/2 of a circular pizza left over from a party. he takes a third if it as a snack and evenly splits up the rest to share
    6·1 answer
  • A basketball team has five players how many different teams can be formed from 15 people if position doesn't matter
    6·1 answer
  • Can someone help me with finding the answer on this. It’s very important and I am having trouble.
    7·1 answer
  • A snail travels 3 1/3 ft every hour. How far does the snail travel in 2 1/2 hours? Express your answer in simplest form.
    11·2 answers
  • What is decimal expansion of <img src="https://tex.z-dn.net/?f=%5Cfrac%7B284%7D%7B3%7D" id="TexFormula1" title="\frac{284}{3}" a
    9·1 answer
  • If P(A) = 0.996, what is the value of P(A)?
    7·1 answer
  • 1
    15·1 answer
  • PLEASEEEEEEEEEEEEEEEEEEEEEEE
    15·1 answer
  • Please help me. Thank you!
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!