9/21 + 14/21 = 23/21 or 1 and 2/21
I believe A. would be the answer
SORRY IF WRONG
#2) Use quotient rule

Remember for solving log equations:

#3) Derivative of tan = sec^2 = 1/cos^2
Domain of tan is [-pi/2, pi/2], only consider x values in that domain.
#4 Use Quotient rule
#9 Use double angle identity for tan

This way you can rewrite tan(pi/2) in terms of tan(pi/4).
Next use L'hopitals rule, which says the limit of indeterminate form(0/0) equals limit of quotient of derivatives of top/bottom of fraction.
Take derivative of both top part and bottom part separately, then reevaluate the limit. <span />
5x2 would be 10 and 10-50x would be negative 40x and 40x + 125 would be 165x
Answer:
its b
Step-by-step explanation:
because you always have to divide by the number on top