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Using the chain rule?

2007-10-09 03:46:37 · 4 answers · asked by yefimthegreat 1 in Science & Mathematics Mathematics

4 answers

This is the way the chain rule works. For any function u

du/dx = u' du/dx.

So if u(x) = sin(x)

d(u²)/dx = u' du/dx = 2u du/dx

du/dx = dsin(x)/dx = cos(x)

So the result is 2sin(x)cos(x) = sin(2x)

2007-10-09 04:23:53 · answer #1 · answered by Astral Walker 7 · 1 0

i THINK (im in this same class doing the same thing)
that the answer issss...
2sinx*cosx
because the differentiation of sin^2 is 2sinx and
the differentiation of sinx is cosx

2007-10-09 10:53:56 · answer #2 · answered by keithaa 1 · 0 0

y = sin ² x
y = (sin x) ²
dy/dx = 2 ( sin x )( cos x )
dy/dx = sin 2x

2007-10-09 11:05:42 · answer #3 · answered by Como 7 · 0 0

if you mean y = (sinx)^2 then
let z = sinx
then y = z^2
(dy/dz)*(dz/dx) = 2z * cosx = 2 sinx cosx

2007-10-09 10:57:05 · answer #4 · answered by 1101-1001 2 · 0 0

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