Pleeasse help :(
i need an understanding w/ this not just an answer.
please and thanks!

If sin(x) = 0 and cos(x) = 1, what is tan(x)?

Find the magnitude, correct to two decimal places, made by each of the following with positive direction of the x axis a) y= x the answer is 45° but i don’t know how

What will be the end result for the taxpayer who filed his federal income tax return using the 1040ez form shown belowa he'll owe $173b he'll receive a refund of $173c he'll owe $3921d he'll receive a refund of $3921