Monday

October 20, 2014

October 20, 2014

Posted by **Julie** on Friday, April 20, 2012 at 2:57pm.

A1) y = e^x(Sin²x)

A2) y = e²Sin²x

B1) y = (x³ + 1)e^-2

B2) y = (x² + 1)e^-2

C) y = x²(theta^Sinx)

- Calculus grade 12 -
**Damon**, Friday, April 20, 2012 at 3:09pmI am not going to do all these

if y = u(x) v(x)

then dy/dx = u dv/dx + v du/dx

for A1

u = e^x so du/dx = e^x

v = sin^2 x so dv/dx = 2 sin x cos x

so

dy/dx = 2e^x sin x cos x + e^x sin^2 x

= e^x sin x ( 2 cos x + sin x)

- Calculus grade 12 -
**Julie**, Friday, April 20, 2012 at 4:11pmCould you help me for these two:

b) y = (x²+1)e^-4

c) y = x²(e^Sinx)

Please & Thank you.

- Calculus grade 12 -
**Damon**, Friday, April 20, 2012 at 6:36pme^-4 is a constant

so

e^-4(2x)

x^2 d/dx (e^sin x) + 2 x e^sin x

x^2 (e^sin x)cos x + 2 x e^sin x

x e^sin x [ x cos x + 2 ]

- Calculus grade 12 -
**Julie**, Friday, April 20, 2012 at 9:33pmThe answer for b) is e^-4(2x) ?

And everything after that is for c) right. So the final answer for c) would be xe^sinx(xcosx + 2)

?

Thankyou.

- Calculus grade 12 -
**Julie**, Friday, April 20, 2012 at 9:34pmIn part c) for xcosx could you simplify that or do you keep it as xcosx? Thanks

**Answer this Question**

**Related Questions**

Calculus grade 12 - Determine the derivative of the function (² = square): a) y...

calculus - Could someone check my reasoning? thanx Find the derivative of the ...

Calculus 12th grade (double check my work please) - 1.)Find dy/dx when y= Ln (...

Quantum mechanics, eigenfunctions! - Determine if the function sin(x)*e^(ax) ...

Calculus - Consider the function f(x)=sin(1/x) Find a sequence of x-values that ...

Calculus Help and Check - find the derivative of the function integral from cosx...

Calculus - Consider the function f(x)=sin(1/x) Find a sequence of x-values that ...

Calculus - Consider the function f(x)=sin(1/x) Find a sequence of x-values that ...

math - Eliminate the parameter (What does that mean?) and write a rectangular ...

Calculus I - Find the derivative of f(x) = sin^2 (e^sin^2 x) I wonder if I'm ...