$cis(x)=\cos x+i\sin x\\\\cis15^o=\cos15^o+i\sin15^o\\\\\cos15^o=\dfrac{\sqrt6+\sqrt2}{4};\ \sin15^o=\dfrac{\sqrt6-\sqrt2}{4}\\\\\text{therefore}\\\\7cis15^o=7\left(\cos15^o+i\sin15^o\right)=7\cos15^o+7i\sin15^o\\\\=7\left(\dfrac{\sqrt6+\sqrt2}{4}\right)+7\left(\dfrac{\sqrt6-\sqrt2}{4}\right)i$

6 0

3 years ago

Sally sold 1000987 hot dogs 3 years how many will she sell in 6 years

Alexandra [31]

So 1000987 in 3 years or 1000987:3 or i like to put it as 1000987:3
we notice that 6 is 2 times of 3 so we just multiply 1000987:3 by 2 and get 2001974:6
2001974 in 6 years

7 0

3 years ago

2852.1 rounded to the nearest tenth of a mile

katrin2010 [14]

2852.1 rounded to the nearest tenth of a mile is still 2852.1

5 0

3 years ago

Read 2 more answers

Can anyone help me with this

yaroslaw [1]

Answer:

answer is 11 feet is the correct answer

5 0

3 years ago