Prove that (1+sin2x)/(1-sin2x)=cot^2(x-pi/4)

Which equation matches the graph shown ?

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.

Is ofat (-25, 0), (25, 0) co- (0, -15), (0, 15)?