What are some good pranks to pull on your online best friend?

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

Find cot x if sin x cot x csc x = √2

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.