Which expression is equivalent to 1/sin(2x)-cos(2x)/sin(2x)? tan(x) -tan(x) 1/cos(x) -1/cos(x)

Adan has decided to purchase an $9000 car. he plans on putting 20% down toward the purchase and financing the rest at 7.9% interest rate for 3 years. find his monthly payment a) $225.29 b) $298.81 c) $204.78 d) $236.89