Two correct answers:
9 + x
x + 9
Or you can say
x - -9
or
9 - -x
#2) Use quotient rule
![\frac{f'g - fg'}{g^2}](https://tex.z-dn.net/?f=%5Cfrac%7Bf%27g%20-%20fg%27%7D%7Bg%5E2%7D)
Remember for solving log equations:
![e^{ln x} = x](https://tex.z-dn.net/?f=e%5E%7Bln%20x%7D%20%3D%20x)
#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
![tan(2x) = \frac{2tan x}{1-tan^2 x}](https://tex.z-dn.net/?f=tan%282x%29%20%3D%20%5Cfrac%7B2tan%20x%7D%7B1-tan%5E2%20x%7D%20)
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 />
3x(d+7) < 5d-13 (I think it is
p(-5, 2)
the rule is x + 3, so add -5 + 3 = -2
the x coordinate of P' is -2
Answer:
ask to your teachers and you will be finish the work