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

sorry had some connection problems :D I'll do it now :D

Answer 2

y'=2*2cos(x^2+2)*(-sin(x^2+2))*2x=-8xsin(x^2+2)cos(x^2+2) so the answer is d

Answer 3

i disconnect to on OS

Answer 4

they update the site from time to time, so we all lose connection...