Question

Please help anyone...see attachment

Answer 1

Did you find the first derivative?

Answer 2

I came up with -5sin(-π)-5cos(-π) / (sin (-π) + cos(-π)^2 so far.... :)

Answer 3

You did the bottom times the derivative of the top. then you must subtract the top times the derivative of the bottom. That is the numerator of the derivative.

Answer 4

Like this 5*[cos(x)-x*cos(x)+sin(x)+x*sin(x)]/([cos(x)+sin(x)]^2)?

Answer 5

Yes

Answer 6

Now plug in -pi

Answer 7

yup and i get -5sin(-π)-5cos(-π) / (sin (-π) + cos(-π)^2... not sure if that's right

Answer 8

What is the sin of -pi?

Answer 9

0

Answer 10

What is the cos of - pi?

Answer 11

-1

Answer 12

Plug those values in and evaluate.

Answer 13

Oh thanks

Answer 14

yw