Find the exact value of tan ̈́ given that sin ̈́ = and ̈́ is in quadrant IV. Rationalize denominators when applicable. Select the correct choice below and if necessary, fill in the answer box to complete your choice. tan ̈́ = 0.5 (Simplify your answer. Type an exact answer, using radicals as needed. Type an integer or fraction.) The function is undefined.