If f(x) = (e^(x))sin(x) what is the 1000th derivative?
Step are needed and the general rule/pattern
y = e^x(sinx)
yI = e^xcosx + e^xsinx
= e^x(cosx + sinx)
yII = e^x(-sinx + cosx) + e^x(cosx + sinx)
= e^x(2cosx) = 2e^x(cosx)
yIII = 2e^x(-sinx) + 2e^x(cosx)
= 2e^x(cosx - sinx)
yIV = 2e^x(-sinx-cosx) + 2e^x(cosx - sinx)
= 2e^x(-2sinx_
= -4e^x(sinx)
Ahhh so it took 4 derivatives to reach -4(what we started with)
so yVIII would be (-4)(-4)e^x(sinx)
etc.
so y1000= (-4)^250(e^x(sinx))
= (4^250)(e^x(sinx))
where did u get the 250 from?
every fourth one is 4 times four before it.
and
1000/4 is 250
To find the 1000th derivative of the function f(x) = e^x * sin(x), we can follow these steps:
Step 1: Start by computing the derivative of f(x) with respect to x.
f'(x) = (e^x * sin(x))' = (e^x * sin(x)) + (e^x * sin(x))'
Step 2: Compute the derivative of sin(x) with respect to x using the product rule.
sin'(x) = cos(x)
Step 3: Apply the product rule to find the derivative of (e^x * sin(x)).
(e^x * sin(x))' = (e^x * cos(x)) + (e^x * sin(x))'
Step 4: Notice that we have a repeating pattern in each derivative. The derivative of (e^x * sin(x)) is always of the form:
(e^x * cos(x)) + (e^x * sin(x))'
Step 5: Based on the pattern identified, we can determine the general rule for the nth derivative of f(x).
n-th derivative of f(x) = (e^x * cos(x)) + (n-1) * (e^x * sin(x))'
Step 6: Now, let's find the second derivative (n = 2) to verify the general rule.
f''(x) = (e^x * cos(x)) + (2-1) * (e^x * sin(x))'
= (e^x * cos(x)) + (e^x * sin(x))'
Step 7: The second derivative matches our original function f'(x), confirming the general rule.
Step 8: Finally, using the general rule, we can find the 1000th derivative.
f^(1000)(x) = (e^x * cos(x)) + (1000-1) * (e^x * sin(x))'
Step 9: Simplifying the equation gives us the final solution for the 1000th derivative of f(x).
Therefore, the 1000th derivative of f(x) = (e^x * cos(x)) + 999(e^x * sin(x))'