Translate into a variable expression the product of p and the sum of p and 12

What is the area of triangle pqr on the grid? a triangle pqr is shown on a grid. the vertex p is on ordered pair 7 and 6, vertex q is on ordered pair 1 and 6, and the vertex r is on ordered pair 4 and 2. 5 square units 6 square units 10 square units 12 square units

Can someone me with the property questions for 12 13 and 14 plz

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).