2006-09-30 18:33:16 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
if 'x' is variable and 'a' is constant, then -
derivative of x:
d/dx (a^3) + d/dx {cos^3(x)}
= 0 + 3 * cos^2(x) * d/dx {cos(x)}
= 3 * cos^2(x) * { - sin(x)}
= - 3 * sin(x) * cos^2(x) [ans]
if 'x' is constant & 'a' is variable, then -
derivative of a:
d/da (a^3) + d/da {cos^3(x)}
= 3 * a^2 + 0
= 3 * a^2 [ans]
2006-09-30 18:42:03 · answer #1 · answered by Firefly 2 · 2⤊ 0⤋
I feel it is with respect to x and a is constant
d/dx(a^3+ cos^3(x))
= d/dx(a^3) + 3 cos^2 x d/dx(cos x)
= -3 sin x cos^2 x (as d/dt(a^3) =0 when a is constant
2006-10-01 01:39:57 · answer #2 · answered by Mein Hoon Na 7 · 0⤊ 0⤋
yes yes i know iknow it's it's.i forgot.
2006-10-01 02:28:56 · answer #3 · answered by likeablerabbit_loose 4 · 0⤊ 0⤋
For which variable...a or x?
2006-10-01 01:35:20 · answer #4 · answered by SkyWayGuy 3 · 0⤊ 0⤋