Calculus questions for math

Calculus
Tutor: None Selected Time limit: 1 Day

14)Find an equation of the tagent line to the graph of f(x)=x^2-2x-3 at the point (-2,5)

15)Fin f'(x):f(x)=x^2+3sinx

16)Find dy/dx for y=x(x+1)^1/3     -I rewrote x+1^1/3

17)Fin dy/dx if x^2+y^2=2xy

18)Differentiate y=sex^2x+tan^2x   also do, y=2x/1-3x^2

Nov 18th, 2014

14.

take the derivative: 4x -2 (power rule) 
put -2 in for x, like given in problem. 
so... 4(-2)-2 = -10 
that would be the slope of the line 

equation of line 


y - 5 = -10(x + 2) 

or 
y= -10x-15


15.f'(x)=2x+3cosx

16.dy/dx=x.(1/3)(x+1)^(-2/3)+(x+1)^1/3

17.x^2+y^2=2xy

2x+2y*dy/dx=2(xdy/dx+y)

x+ydy/dx=xdy/dx+y

dy/dx(y-x)=y-x

dy/dx=-1


18.

y=sec^2 (x)+tan^2 (x) 
y'=2sec (x).[sec(x)]'+2tan (x).[tan(x)]' 
y'=2sec (x).[sec(x)tan(x)]+2tan (x).[sec^2(x)] 
y'=2sec^2 (x).tan(x)+2tan (x).sec^2(x) 
y'=4sec^2 (x).tan(x)




(Using Quotient Rule) 
which is 
d/dx [f(x) / g(x)] = [f '(x)g(x) - f(x)g'(x)] / g(x)^2 

y'=[2(1 - 3x^2) - (2x)(-6x)] / (1-3x^2)^2 
y'=[2 - 6x^2 + 12x^2] / 1-6x^2+ 9x^4 
y'=[2+6x^2] / 9x^4-6x^2+1

    Nov 18th, 2014

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