Hi everyone, having a lot of trouble with Calculus and was wondering if anyone can help.
I have d(t)= -5e^(-5t) x cos(10t)
u = -5e^(-5t)
v = cos(10t)
du/dx = 25e^(-5t)
dv/dx = -10sin10t
duv/dx = 25e^(-5t) x cos(10t) + (-10sin10t) x -5e^(-5t)
= 25e^(-5t)cos(10t) + 50e^(-5t)sin10t
From here I am not sure where to go? Do I have the first bit correct?
0=2 x 1 x 10t
Or do i have to find out tan = sin(a) / cos (a)
If anyone could give me some kicks in the right direction it would be much appreciated, and i can stop wasting paper.