- #1

PsychonautQQ

- 784

- 11

## Homework Statement

find dy/dx as a function of t for the parametric equations

x=cos^7(t)

y=6sin^2(t)

## Homework Equations

## The Attempt at a Solution

well i'm looking for dy/dx.. so first i found dy

dy = 12sin(t)cos(t)

and dx

dx = -7cos^6(t)sin(t)

dy/dx = 12sin(t)cos(t) / -7cos^6(t)sin(t)

(-12/7cos^5(t))

And then it asks for if the curve is concave up or concave down (besides where it is undefined). When i graph it on wolfram alpha it gives both up and down concaves so it leads me to believe I did this wrong. Help