1.use implicit differentiation to find dr/d(theta)

tan (r(theta))=1/2

dr/d(theta)=?

2. If x^3+y^3=7, find the value of d^2y/dx^2 at the point (-1,2).

The value of d^2y/dx^2 at the point (-1,2) is?

This one is really tough

3. Find the lines that are tangent and normal to the curve at the given point.

y=7 sin (pie(x)+7), (-1,0)

The line tangent to the curve y=7 sin (pie(x) + y) at (-1,0) is y=