Prove that (cosec theta / cosec theta -1 )+(cosec theta /cosec theta +1) = 2 sec^2 theta

Ms.lopez has 4 liters of chemicals that she is going to pour into beakers. each beaker will have 1/4 of a liter of chemicals, how many beakers can ms.lopez fill? draw a model to support your work. (it's ok if you dont)

David pays a 20% income tax on his $2,100 salary. how many dollars is the tax? show work

Find the area of right triangle abc.