a. cos (a+B) b. sin (a+b) c. tan (+) 3 3x 2 3x an a= < < and cos= < <2* 13 2 CXXX 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 expre , 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 expr tan (a+b)- Use integers or fractions for any numbers in the expr