Solve the following. Please provide a Clean and clear readable handwritten complete solutions. Minimize erasures and provide a clear picture of the solutions thank you and Godbless.

3. Use the exactness test to show that the Differential Equation is EXACT. Then solve it., a. (cos x cos y - cot x)dx - (sin x sin y) dy = 0 b. (x + sin y - cos y) dx + x (sin y + cos y) dy = 0 c. yes xy + (x e^ xy + sin y) dy/dx = 0