its asking what the partial derivative of 4Sin(7x - pi/2) is when x = 0
the partial derivative of sin(x) is cos(x) and by the chain rule:
d/dx = 4*Cos(7x- pi/2)* 7 which simplifies to 28Cos(-pi/2) at x = 0
and 28Cos(-pi/2) = 0
Ooor you could just do the calculus before integrating and you get d/dx=4 (or some other constant if i made a mistake). And partial integral of a constant is always 0.
You guys don't know that Captcha only requires one of the words to be right? One word in a captcha is always in a certain font (in the picture it's the one on the left), that word is the word that is processed. It is always that font, and always pretty readable. The other 'word' (it can be a number or whatever the **** it wants to be) is just a piece of data that Captcha has picked up throughout the internet, and it is not processed by Captcha. This means you can put whatever you want instead of the other 'word', I usually opt for ' ******* . But what makes Captcha so good, is that bots will try to read and process the often unreadable and un-processable data 'word', meaning they get stuck and can't do jack **** .
So yeah, the more you know.
tl;dr you only need to type in one word correctly, and it's always the same font.