Question

how to find the value of a derivative at the given point?

Answer 1

the function was f(x) = 2+cosx
the deriv is 3-sinx

point is (pi,-1)

Answer 2

er
function was f(x) - 2+3cosx

Answer 3

is the value 3?

Answer 4

How did you get the 3 in the "3-sinx"?

Answer 5

Derivatives of sums are simply the derivatives of the two terms being added individually. So the derivative of 2+cosx is the derivative of 2 plus the derivative of cosx.

Answer 6

by plugging in pi for x

Answer 7

o
i used wolfram alpha

Answer 8

and followed the steps shown there

i just need to know if i should plug in 3 for

Answer 9

Okay well that would be the easy way out, and you wouldn't learn anything ^^ You want to find the derivative of the function first, then plug in the point into that derivative function.

Answer 10

tyvm