Thursday

December 18, 2014

December 18, 2014

Posted by **Brian** on Saturday, April 20, 2013 at 5:24pm.

x(1)=1 y(1)=1 z(1)=-1

df/dt=(3cos(3x-yz))(e^(t-1))+(cos(3x-z))(3t^2)+(cos(3x-y))(1)

I seriously need help on this and tell me the answer and show your work through steps. Thanks.

- Urgent math -
**Steve**, Sunday, April 21, 2013 at 6:33amusing x' for dx/dt, etc,

dF/dt = Fx x' + Fy y' + Fz z'

= 3cos(3x-yz)(e^(t-1)) - zcos(3x-yz)(3t^2) - ycos(3x-yz)(1)

at t=1,

dF/dt = 3cos(4)(1) + cos(4)(3) - cos(4)(1)

= 5cos(4)

Hard to see what the difficulty is; they gave you the formula for df/dt, as well as the values for t,x,y,z. Just plug them in. If you don't see how to come up with df/dt, review partial derivatives some more.

**Answer this Question**

**Related Questions**

Mathematics - Trigonometric Identities - Let y represent theta Prove: 1 + 1/tan^...

TRIG! - Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6...

tigonometry - expres the following as sums and differences of sines or cosines ...

Math - Calculus - The identity below is significant because it relates 3 ...

algebra - Can someone please help me do this problem? That would be great! ...

trig - Reduce the following to the sine or cosine of one angle: (i) sin145*cos75...

Math, derivatives - Let g(x) = sin (cos x^3) Find g ' (x): The choices are a) -...

Math - Solve this equation algebraically: (1-sin x)/cos x = cos x/(1+sin x) --- ...

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

pre-cal - Simplify the given expression........? (2sin2x)(cos6x) sin 2x and cos ...