Find the difference:
5 2
7 7​

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?

Consider circle c with angle acb measuring 3/4 radians. if minor arc ab measures 9 inches, what is the length of the radius of circle c? if necessary, round your answer to the nearest inch.