Verify this identity

cos(-x)+tan(-x)/cot(x)=sec^2(x)

Which of the following expressions is equal to 2x^2+8

Clara schumann is buying bagels for her coworkers, she buys a dozen bagels priced at $5.49 a dozen. the bakery's cost for making the bagels is $2.25 per dozen. what is the markup rate based on selling price on a dozen bagels?

Find the distance between (0,5) & (-4,2)