Computing implicit derivative

1.-2x^5 *y^3-6x^2 *y^2 = -2(y+x)^5

2. -2*y*sin(5x^2)=7x*cos(-4y^2)

3. (x*y)^1/2 =(3^2)*y-2

Find the tangent lineof the implicitcurves

1.y*sin(2x)=x*cos(5y) at the point (pi/2 and pi/10)

2.y^2 + x^2 + x*y=1 at the point(1,-1)

3. y^4/3 +x^4/3 =40 at the point(6sqrt(6) and 2sqrt(2)