Question 10 plz show ALL STEPS.

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

5× 1/2 = ? a) more than 5 because you are multiplying by a whole number b) 5/10 because you multiply the numerator and denominator by 5 c) less than 5 because you are multiplying by a number that is more than 1 d) less than 5 because you are multiplying by a number that is less than 1

Find the value of x that will make l ll m