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kompoz [17]
3 years ago
5

(-2abc) (6a?) (4bc) (d)

Mathematics
1 answer:
mars1129 [50]3 years ago
8 0

Answer:

2ABC=7GYE+RGIFG-32946896223

Step-by-step explanation:

34UIO5Y34O45YOYOR-837370+83489264o

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Find the imaginary part of\[(\cos12^\circ+i\sin12^\circ+\cos48^\circ+i\sin48^\circ)^6.\]
iren [92.7K]

Answer:

The imaginary part is 0

Step-by-step explanation:

The number given is:

x=(\cos(12)+i\sin(12)+ \cos(48)+ i\sin(48))^6

First, we can expand this power using the binomial theorem:

(a+b)^k=\sum_{j=0}^{k}\binom{k}{j}a^{k-j}b^{j}

After that, we can apply De Moivre's theorem to expand each summand:(\cos(a)+i\sin(a))^k=\cos(ka)+i\sin(ka)

The final step is to find the common factor of i in the last expansion. Now:

x^6=((\cos(12)+i\sin(12))+(\cos(48)+ i\sin(48)))^6

=\binom{6}{0}(\cos(12)+i\sin(12))^6(\cos(48)+ i\sin(48))^0+\binom{6}{1}(\cos(12)+i\sin(12))^5(\cos(48)+ i\sin(48))^1+\binom{6}{2}(\cos(12)+i\sin(12))^4(\cos(48)+ i\sin(48))^2+\binom{6}{3}(\cos(12)+i\sin(12))^3(\cos(48)+ i\sin(48))^3+\binom{6}{4}(\cos(12)+i\sin(12))^2(\cos(48)+ i\sin(48))^4+\binom{6}{5}(\cos(12)+i\sin(12))^1(\cos(48)+ i\sin(48))^5+\binom{6}{6}(\cos(12)+i\sin(12))^0(\cos(48)+ i\sin(48))^6

=(\cos(72)+i\sin(72))+6(\cos(60)+i\sin(60))(\cos(48)+ i\sin(48))+15(\cos(48)+i\sin(48))(\cos(96)+ i\sin(96))+20(\cos(36)+i\sin(36))(\cos(144)+ i\sin(144))+15(\cos(24)+i\sin(24))(\cos(192)+ i\sin(192))+6(\cos(12)+i\sin(12))(\cos(240)+ i\sin(240))+(\cos(288)+ i\sin(288))

The last part is to multiply these factors and extract the imaginary part. This computation gives:

Re x^6=\cos 72+6cos 60\cos 48-6\sin 60\sin 48+15\cos 96\cos 48-15\sin 96\sin 48+20\cos 36\cos 144-20\sin 36\sin 144+15\cos 24\cos 192-15\sin 24\sin 192+6\cos 12\cos 240-6\sin 12\sin 240+\cos 288

Im x^6=\sin 72+6cos 60\sin 48+6\sin 60\cos 48+15\cos 96\sin 48+15\sin 96\cos 48+20\cos 36\sin 144+20\sin 36\cos 144+15\cos 24\sin 192+15\sin 24\cos 192+6\cos 12\sin 240+6\sin 12\cos 240+\sin 288

(It is not necessary to do a lengthy computation: the summands of the imaginary part are the products sin(a)cos(b) and cos(a)sin(b) as they involve exactly one i factor)

A calculator simplifies the imaginary part Im(x⁶) to 0

4 0
3 years ago
What are some ways in which graphs can mislead or misinform readers
Anna [14]
By not being up to scale,drawn incorrectly, or have the wrong information printed on the axes
6 0
3 years ago
05.01)A poster is shown below: A rectangle is shown. The length of the rectangle is labeled 18 inches. The width of the rectangl
ololo11 [35]
Length = 7/2 x 18 = 63 inches

Width= 7/2 x 6 = 21 inches

Answer: The dimensions are 63 inches by 21 inches.
6 0
4 years ago
Someone please help me with my work and please drop your email so I can share you with the document
masya89 [10]

Answer:

uADHTiszA?kv

Step-by-step explanation:

3 0
3 years ago
What is the answer to this fraction ?
sammy [17]

Answer:

7 3/12 simplified 7 1/4

Step-by-step explanation:

first make 1/3 into the same denominator as 7/12

so 3 and 12 both have 4 in common so

4 times 1/3 = 4/12

then just subtract

and you would get 7 3/12 which could be simplified to 7 1/4

7 0
3 years ago
Read 2 more answers
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