Question

the derivatives with respect to x of 2cos^2(x^2 + 2).
a. 4sin(x^2 + 2) cos (x^2 + 2)
b. -4sin (x^2 + 2)cos (x^2 + 2)
c. 8xsin(x^2 + 2) cos (x^2 + 2)
d. -8xsin(x^2 + 2) cos(x^2 + 2)

Answer 1

d. -8xsin(x^2 + 2) cos(x^2 + 2)

Answer 2

2cos^(2)(x^(2)+2)
let
(d)/(dv) cos(v)=-sin(v)

(d)/(dx) x^(2)+2=2x

(d)/(dx) 2cos^(2)(x^(2)+2)=-4xcos((x^(2)+2))sin((x^(2)+2))

-4xcos((x^(2)+2))sin((x^(2)+2))

Answer 3

b

Answer 4

sam that formula u use we use it now on calculus

Answer 5

its d

Answer 6

its D =D

Answer 7

wew b or d? lets use b and d

Answer 8

about the x

Answer 9

http://www.wolframalpha.com/input/?i=d%2Fdx+%282+%28cos%28x%5E2+%2B+2%29%29%5E2.%29
its d