Question

Evaluate e(t)=25e^(-t) cos2pi*t
t=0.75

Answer 1

\[25e^{-0.75} \cos 2 pi \times 0.75?\]

Answer 2

this should give 8.85687 using a calculator

Answer 3

Do you want to know how? or??

Answer 4

Yes,please .

Answer 5

e1 has a value of 2.71828....
Plug in the value of 0.75 in the equation.
e^-0.75 = 0.472367
times this by 25 = 11.809...

2pi = 6.28319

11.809cos6.28319 = 11.809
times this by 0.75 = 8.85687

Answer 6

Do you understand?

Answer 7

Yes,thank you.

Answer 8

Good :)

Answer 9

answer is 0
cos2*3.14*.75 is cos (3pi/2) cos is 0 4 (2n+1)pi/2
n is intezer