Calculus 12th grade (double check my work please)

2- given the curve is described by the equation r=3cos ¥è, find the angle that the tangent line makes with the radius vector when ¥è=120¨¬.

A. 30¨¬
B. 45¨¬
C. 60¨¬
D. 90¨¬
not sure A or D

2.) which of the following represents dy/dx when y=e^-2x Sec(3x)?
A.3e^-2x sec(3x) tan (3x)-2e^-2x Sec(3x)<<<< my choice
B.)3e^-2x sec(3x)tan (3x)-2xe^-2x sec(3x)
C.)3e^-2x sec(3x)tan (x)-2e^-2x Sec(3x)
D.)3e^-2x sec(3x)tan (x)-2xe^-2x sec(3x)

3.)calculate dy/dx if y=Ln(2x^3+3x)
D.)6x^2+3/2x^3+3x <<<< my choice

Thank you!

asked by anon
  1. 2 and 3 are right.

    the first one is a trick question. It is a circle, so the tangent line is always 90 degrees to the radius

    posted by Jay

Respond to this Question

First Name

Your Response

Similar Questions

  1. Calc.

    sketch the curve using the parametric equation to plot the points. use an arrow to indicate the direction the curve is traced as t increases. Find the lenghth of the curve for o<t<1. Find an equation for the line tangent to
  2. Precalc

    Find a rectangular equation for the plane curve defined by the parametric equations. x = sin(theta) y = 3cos(theta)
  3. AP calculus

    Find the equation of the normal to the curve f(x) = 3cos(2x) at the point x = 0. In class, we learnt to find the derivate of the function, which would represent the slope. After I did that, I found the slope to be 0.. but that is
  4. Calculus

    Please help this is due tomorrow and I don't know how to Ive missed a lot of school sick Consider the curve given by the equation x^3+3xy^2+y^3=1 a.Find dy/dx b. Write an equation for the tangent line to the curve when x = 0. c.
  5. calc

    Suppose a curve is traced by the parametric equations x=1sin(t) y=18-3cos^2(t)-4sin(t) At what point (x,y) on this curve is the tangent line horizontal?
  6. Calculus 2

    Consider the polar curve: r=3cos(3ϴ) a) Find the area of the first leaf of the graph. -Thank you.
  7. 12th Grade Calculus

    1. a.) Find an equation for the line perpendicular to the tangent curve y=x^3 - 9x + 5 at the point (3,5) [* for a. the answer that I obtained was y-5 = -1/18 (x-3) ] b.) What is the smallest slope on the curve? At what point on
  8. maths

    Find the equation of the curve through (4,2) whose tangent (for x > 0) forms an angle with the x-axis, the tangent of which is equal to 1 . Sketch the curve for x x > 0. √
  9. calc

    for the parametric curve defined by x=3-2t^2 and y=5-2t ...sketch the curve using the parametric equation to plot of the point. use an arrow to indicate the direction of the curve for o<t<1. Find an equation for the line
  10. math

    A curve has implicit equation x^2-2xy+4y^2=12 a)find the expression for dy/dx in terms of y and x. hence determine the coordinates of the point where the tangents to the curve are parallel to the x-axis. b)Find the equation of the

More Similar Questions