Find the exact value of each of the following under the given conditions. a. cos (a + p) b. sin (a + B) c. tan (a + p) 1 3x tan of= WIN 7 , and cos B= 7. 7 = B = 21 . . . a. cos (a + B) = (Type an exact answer using radicals as needed. Simplify your answer. Rationalize all denominators. Use integers or fractions for any numbers in the expression.) b. sin (a + P) = (Type an exact answer using radicals as needed. Simplify your answer. Rationalize all denominators. Use integers or fractions for any numbers in the expression.) c. tan (a + B) = (Type an exact answer using radicals as needed. Simplify your answer. Rationalize all denominators. Use integers or fractions for any numbers in the expression.)