<span>Mc Donald’s is a popular fast food restaurant chain in America. Its humble beginning was started by Richard Mc Donald’s last 1940. Today it has been scattered in about 120 countries, with a total of 36,525 Mc Donald branches all over the world. However, drive-throughs are more in demand in the United States that would cause more than a hundred branches to stop its operation.</span>
Answer:
sec(4x) + C
Explanation:
original problem: ∫sec(4x)tan(x)dx
use integration by substitution (u-sub) by setting u = 4x
if u = 4x, then du/dx = 4 and du = 4dx (dx = du/4)
after substitution the integral is ∫sec(u)tan(u)(du/4)
move the 1/4 out of the integral by using the integral Constant rule to form 1/4∫sec(u)tan(u)du
the anti-derivative of sec(u)tan(u) is sec(u), memorize your trigonometric derivatives!!!!
after integration, we get sec(u)/4 + C , now plug u back into the equation
sec(4x) + C is the general solution
none of them are a right angle since there isn't an angle on any of those measurements that are 90 degrees.
IT should be <u><em>C. SCREDEIVERS</em></u>
