- #1
PsychonautQQ
- 784
- 10
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