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

6 0

3 years ago

5/8 divided by 7/10 for the lowest fraction

o-na [289]

Answer:

5/8 ÷ 7/10 = 25/28

Uh i believe this is the lowest fraction it can go to

7 0

2 years ago

Read 2 more answers

Mathematically, how does kinetic energy depend on mass?<br> Someone PLZ HELP!

Artist 52 [7]

Answer: Hello sir, Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. = 1/2 m v2. If the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

Step-by-step explanation:

8 0

3 years ago