Simplify each expression by first substituting values from the table of exact values and thensimplifying the resulting expression.     sin 2  60 0  + cos 2  60 0

Use the cosine of a sum and cosine of a difference identities to find cos (s+t) and cos (st). sin s= 5 13 and sint = - 4 s in quadrant I and t in quadrant III 5 cos (s+t)= (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.) cos (st) = ☐ (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.)

Express the given sum or difference as a product of sines and/or cosines. cos x + cos 5x cos x + cos 5x = (Simplify your answer.)

Which of the following expressions could be used to determine the exact value of cos 300°? a 1-2sin²(150) b с d 2sin(150°) cos(150°) 2cos²(300°) - 1 cos²(300°) - 2sin(300°)