ANSWER

EXPLANATION
The given product is:

We expand using the distributive property to obtain:

Extract the perfect squares to get:

Expand further to get;

This simplifies to,

Ignore the fact that it says limit because when sin (pi) is here it is not an Undefined Point, whatever value the calculator says is sin(pi) is the answer.
If you need area of the trapezoids:
Area of parallelogram = 10×7 = 70 sq. units
Area of each trapezoid = 1/2 × area of parallelogram = 1/2 × 70 = 35 sq. units