integrating sine functions

Posted, it here as the homework has no help was given in the other thread, and it has become a matter which quite urgently must be solved.

I am to determine the area between these two curves. Although I am familiar to the process I fail to recognize and grasp what one should do to these specific types of functions. If possible could someone assist me and post a solution along with work so I can process it.

To the question.

We are to find the area between these two curves

y = 8.5sin(0.32x-0.12)+0.56

y = 4.7sin(0.42x+0.5)-4.3

From x=-10 to x=10

Thanks in advance