Question

what is 7xcos + 4 cos -2 sin in derivative form?

Answer 1

do u mean find the derivative of
\[ y=7x\cos x+4\cos x-2\sin x \]
?

Answer 2

yes

Answer 3

do u know how to compute derivatives?

Answer 4

yes i am just having trouble with it
this is wat i got

Answer 5

-7sinx + (-4sinx) -(2cosx)

Answer 6

i got
\[\large y'=7\cos x+7x(-\sin x)+4(-\sin x)-2\cos x \]

Answer 7

which can be rewritten as
\[\large y'=5\cos x-(7x+4)\sin x \]

Answer 8

Im kind of lost

Answer 9

with which part?

Answer 10

y did you put 7cosx

Answer 11

with +7x

Answer 12

u have \(7x\cos x\). to differentiate this u use the product rule:
\[\large (uv)'=u'v+uv'. \]
So
\[\large (7x\cos x)'=(7x)'\cos x+7x(\cos x)'=7\cos x+7x(-\sin x) \]

Answer 13

ah ok

Answer 14

thank you

Answer 15

u r welcome