Screenshots

Guess I'm not human.

2011-11-25 17:17:10

the wierd shaped d/dx means the partial with respect to x... but there is only x, so that just makes it the derivative with respect to x. So, first things first, chain rule: (the Derivative of the inside multiplied by the derivative of the outside without changing the inside.) The inside is: 7x - pie/2. pie/2 is a constant, so the derivative of the inside is 7. Now the dervaitive of the "outside" is the derivative of sin(7x-pie/2) without worrying about the 7x-pie/2 part. The derivative of sin is cos. So that leaves us with cos(7x-pie/2). Putting it all back together we get that the derivate is: 4 * 7 * cos(7x-pie/2) or 28cos(7x-pie/2). Now solve it. X = 0 so we get: 28cos(pie/2). pie/2 is equivalent to 90 degrees. cos(90 degrees) = 0. So finally we have 28 * 0 = 0. The answer is 0. Hopefully I didn't make a mistake.

2011-11-25 17:41:42

What kind of website are you trying to get onto!?

2011-11-25 18:02:17

wait...this dosnt look like the math used to count my money! so its highly irrelevant to me lol

2011-11-25 18:40:59

42

2011-11-25 22:54:15

f(x) = 4sin(7x - pi/2)

d[f(x)]/dx = 28cos(7x - pi/2)

at limit x = 0,

28cos(-pi/2)

cos is **symmetric, so

28cos(pi/2)

cos(pi/2) = 0

Therefore = 0.

** wtf, initially I wrote that cosine is antisymmetric. I meant symmetric! The relation above holds. f(-x) = f(x) for symmetric functions.

2011-11-25 20:35:58

Taking a guess this security question was from the Click-n-Buy website...

2011-11-25 19:09:01

It's a trap!

2011-11-25 19:45:10

F5, try again

2011-11-25 18:46:28

Magic. Got it.

2011-11-27 00:30:04