Prove the following relation
cot2a-cos2a=cot2a cos2a​

Which math sentence can be used to determine if the triangle is a right triangle?

Subscriptions to a popular fashion magazine have gone down by a consistent percentage each year and can be modeled by the function y = 42,000(0.96)t. what does the value 42,000 represent in the function?

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?