Prove that Sin2(90-theta)(1+cot2(90-theta))=1

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

Acoin bank containing only dimes and quarters has 12 more dimes than quarters. the total value of the coins is $11. how many quarters and dimes are in the coin bank?

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.