1. Find a ax given that y3 + y2 - 5y - x2 = -4. 2. Find a given that x + y = cosy. 3. Find _ given that sin(xy) = x2 +y. 4. Find an equation of tangent line to the given curve at (2, 3) 4x2 + 5xy + 5y2 =915. Find 2: given that 8x4 + 7y4 2 15xy 6. Find 2: given that 9\" = By 7. For the equation V} Z = 2 nd an equation of tangent line to the given curve at (16. 1). 8. Find 2: given that sin(4y2) + 2x = 59V 1) Find the derivative dy cosy' +x = ey dx 2) Find the second derivative dzy dx2 3x2 + y2 = 25 3) Find an equation of the tangent line to the curve x3 + y3 = 18xy at (9, 9). 4) Find an equation of the tangent line to the curve x2y = 9 at (-1, 3). 5) Find an equation of the tangent line to the curve 6x2 + 3xy + 2y2 + 17y -6 = 0 at (1, 0). 6) Find an equation of the tangent line to the curve 4(x2 + y2)2 = 25xy2 at (1, 2)