find (if possible) the exact value of the expression. 10) cos ( pi/4 - pi/3) 14) sin167° cos107° - cos167° sin 107°

What type of rule is being used? Algebra, recíprocal, quotient, Pythagorean or odd/even?

Calculate the exact value of arccos (-1). Note that a special angle is involved, so a calculator is not necessary. (Give an exact answer. Use symbolic notation and fractions where needed. Give the angle in radians. Simplify your answer completely.) arccos Determine the other angle in the interval [0, 2л) when cos(0) = =-11. 0 = 2πt How many solutions does the equation cos(0) = -1have in the interval [0, 2+)? Number of Solutions: radians radians