1) Find the region which satisfies the given inequalities on the unit circle.
2) Write the boundaries of the selected region. The smaller bound must always be the first bound.
3) For sin x and cos x add 2kπ, and for tan x and cot x add kπ.
Math may not teach me how to add love, or how to subtract hate, but it gives me hopes that every problem has a solution .
Mathematics 