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spayn [35]
3 years ago
13

(cos2A−cos2B)2+(sin2A+sin2B)2=4sin2(A+B)​

Mathematics
1 answer:
lbvjy [14]3 years ago
8 0

Answer:

{( \cos2A -  \cos2B)  }^{2}  +  {( \sin2A +  \sin2 B  }^{2}\\    =  ( - 2\cos2A \cos2B  +  { \cos {}^{2} 2A } +  \cos {}^{2} 2B) + (2 \sin2A \sin2B +  \sin {}^{2} 2A +  \sin {}^{2} 2B)\\  \\  { =  - 2(  \sin2A +  \sin 2 B -  \cos2 A -  \cos2B) }\\  \\ { = -  2( - 4 \sin( A + B) \cos(A + B) } \\  \\  =    {\tt{double \: angle \: of \: sine}}\\  \\ { = 2 \times 2(2 \sin (A + B) \cos(A + B)) }\\  \\  { = 4 \sin2(A + B)}

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3. Connie bought several types of candy for Halloween: Milky Ways, Tootsie Rolls,
devlian [24]

Answer:

Tootsie Rolls = 13

Step-by-step explanation:

Given:

Milky Ways and Tootsie Rolls together were 15 more than the number of Reese's Cups.

There were 4 fewer Reese's Cups than Hershey Bars.

There were 12 Milky Ways and 14 Hershey Bars.

Solution

Milky Ways and Tootsie Rolls = Reese's Cups + 15

There were 4 fewer Reese's Cups than Hershey Bars.

Hershey Bars = 14

Then,

Reese's Cups = 14 - 4

= 10

Milky ways = 12

Hershey bars = 14

Reese's Cups = 10

Milky ways = 12

Milky Ways + Tootsie Rolls = Reese's Cups + 15

12 + Tootsie Rolls = 10 + 15

12 + Tootsie Rolls = 25

Subtract 12 from both sides

Tootsie Rolls = 25 - 12

= 13

Tootsie Rolls = 13

7 0
3 years ago
Hernan cuts a board that is 7/10 of a meter long After the cut the board is 3/10 of a meter long how long is the piece that he c
Darina [25.2K]

Given that original lenght of the board before cut = \frac{7}{10}meter

Lenght of the board that is left after cutting from the original piece by Hernan = \frac{3}{10}meter


Now we have to find the lenght of the piece which is cut.

To find that we just need to subtract smaller piece from larger piece


Required Length = \frac{7}{10}-\frac{3}{10}meter

Required Length = \frac{7-3}{10}meter

Required Length= \frac{4}{10}meter

reduce the fraction

Required Length = \frac{2}{5}meter


Hence final answer is \frac{2}{5} meter.

7 0
4 years ago
Read 2 more answers
Find the measure of 2.<br> 63° 117°<br> 62 = [?]<br> Enter
forsale [732]

Answer:

63°

Step-by-step explanation:

Angle <2 and the angle with measure of 63 are alternate exterior angles and has same measurement.

7 0
3 years ago
I don’t know how to do this. can someone please help me :)
Kaylis [27]
The surface area of a cylinder is the sum of the area of the two ends and the lateral area.
.. surface area = 2*(end area) +(lateral area)
.. = 2*(π*r^2) +(2π*r*h)
.. = 2π*r*(r +h)
.. = 2*3.14*(8 in)*(8 in +8 in)
.. = 3.14*256 in^2
.. ≈ 803.8 in^2

The 3rd selection is appropriate.
8 0
3 years ago
I need asers pls now
xxTIMURxx [149]

342 = 2, 3, 6, 9

191 = no factors

1235 = 5

40320 = 2, 4, 8

16 = 2, 4, 8

78448 = 2, 4, 8

588 = 2, 4 , 12

67 = no factors

925 = 5

60043 = no factors

3663 = 3, 6

350 = 5

To learn more about divisibility rules refer to brainly.com/question/9462805

#SPJ9

3 0
2 years ago
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