Prove that (Cos A +cosB)^2+(SinA+sinB)^2=4cos^2(A-B/2 )
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In the 30-60-90 triangle below side s has a length of and side r has a length

In dire need~! describe how to use area models to find the quotient 2/3 divided by 1/5. check your work by also finding the quotient 2/3 divided by 1/5 using numerical operations only.

The coverage of a base station of a telecommunication company forms a disk with a radius of (kilometers). let be the distance of a cellphone from a base station. assume that the location of cellphones in use are randomly uniformly distributed within the disk. calculate the mean and variance for the random variable.