Which expression is equivalent to
(sin x + 1)(sin x − 1)?
a.)cos^2x

c.)cos^2x+ 1
d.)cos^2x − 1
+ 1

Precalculus question, image attached.

The box plots show the average speeds, in miles per hour, for the race cars in two different races. which correctly describes the consistency of the speeds of the cars in the two races?

When i'm with my factor 5, my prodect is 20 .when i'm with my addend 6' my sum is 10.what number am i