Homework Statement
∫ x sinx cosx dx =
Homework Equations
note that sinx cosx = (1/2) sin 2x
The Attempt at a Solution
1/2) ∫ x sin 2x dx =
(1/2) [(-1/2)x cos 2x - ∫ (-1/2)cos 2x dx] =
(1/2) [(-1/2)x cos 2x +(1/2) ∫ cos 2x dx] =
(-1/4)x cos 2x +(1/4) ∫ cos 2x dx =
(-1/4)x cos 2x...
Live cultures of Bacillus thuringiensis (Dipel) and B. subtilis
(Kodiak) are sold as pesticides.What bacterial structures make it
possible to package and sell these bacteria? For what purpose is
each product used?
Is it because it's close to anthrax?(endosporish)
Homework Statement
Find the integral. (Note: Solve by the simplest method - not all require integration by parts.)
∫t ln(t + 2) dt
Homework Equations
∫udv=uv-∫vdu
The Attempt at a Solution
dv=tdt v=tdt=t2/2
u=ln(t+2) du=1/(t+2)dt
∫t ln(t + 2) dt...
Homework Statement
Find Mx,My, & (x bar, y bar) for the laminas of uniform density ρ bounded by the graphs of the equations. (Use rho for ρ as necessary.)
x=-y
x=5y-y2
Homework Equations
m= ∫f(x)-g(x) dx
my= ∫x(f(x)-g(x)) dx =>x bar my/m
mx= 1/2 ∫ (f(x))2-g(x))2dx => y bar=mx/m...
Homework Statement
so I did
Homework Equations
s=∫ba√(1+[f'(x)]2dx
The Attempt at a Solution
y=2/3x3/2+7
y'=x1/2 0≤x≤1
=∫6√(1+(x1/2)2)dx
=[2/3(1+x)3/2]7
my answer came out wrong
Homework Statement
Use the shell method to set up and evaluate the integral that gives the volume of the solid generated by revolving the plane region about the y-axis.
y = √x
Homework Equations
V=2∏∫p(x)h(x) dx
a=0
b=8
The Attempt at a Solution
V=2∏∫(x)(√x)dx
a=0 b=8...
Homework Statement
find the derivative of the function
f(x)=arcsec(4x)
Homework Equations
I think this is a Relevant equations.
d/dx[arcsecu]=u'/(|u|(√u2-1)
The Attempt at a Solution
f'(x)=4/(|4|(√42-1)
=1/√15
I keep getting wrong in my online homework why? :confused:
Homework Statement
arctan(8x-8)=-1
Homework Equations
I'm sure what this part wants.
The Attempt at a Solution
tan[arctan(8x-8)]=tan(-1)
8x-8=tan(-1)
x=(1/8)(tan(-1)+8)
x=(1/8)(-(tan(1)+8)
x=
I am stuck on the last part since the homework says Simplify the above equation...
Homework Statement
Verify the identity:
arctanx + arctan(1/x)=∏/2
using calculus theory.
(Hint: Differentiate the left hand side of the identity)
Homework Equations
?
The Attempt at a Solution
is this correct?
tan(arctanx + arctan(1/x))
= [tan(arctan(x)) +...
Calculate f" for f(x)=g(e^(2x)), where g is a function defined for all real numbers & g admits second order derivative.
please check if I did it right.
f = g(e2x)
f' = 2e2x g'
f'' = 4e2xg' + 2e2xg''
I have expanded out
4e2xg'(u) + 2e2xg''(u)
Homework Statement
Find the point on the graph of f(x)=√x that is closest to the value (4,0).
(differentiate the square of the distance from a point (x,√x) on the graph of f to the point (4,0).)
Homework Equations
f(x)=√x
The Attempt at a Solution
Square of distance from (4,0)...
Homework Statement
Use logarithmic differentiation to find dy/dx for y=(1+x)^(1/x).
Homework Equations
dy/dx
The Attempt at a Solution
ln y = ln (1+x)^(1/x)
= (1/x) ln (1+x)
(dy/dx) /y = (-1/x^2)(ln(1+x) + (1/x)(1/(1+x)
dy/dx = y [(-1/x^2) ( ln(1+x) + x/(1+x) ]
or (-1/x^2)(...
Homework Statement
use the elipson-delta of a limit to justify the answer of: show proof
lim x->0 1/(x+1)
Homework Equations
lim x->0 1/(x+1)=1
The Attempt at a Solution
lim x->0 1/(x+1)
I did some work but after that I don't know how to keep going.
if 0<|x-c|<δ =>...
Homework Statement
find the positive integers k for which
lim x->0 sin(sin(x))/x^k
Homework Equations
exists, and then find the value of the limit
The Attempt at a Solution
I did the first three k's
k=0
lim x->0 sin(sin x))/x^0= 0 undefined
k=1
lim x->0 sin(sinx))/x^1= 1
k=2 I might be...