Houw would i factor this problem out completely?

Find the value. a. 0.003 b. 0.03 c. 0.3 d. 3

What is the next step in the given proof? choose the most logical approach. a. statement: m 1 + m 2 + 2(m 3) = 180° reason: angle addition b. statement: m 1 + m 3 = m 2 + m 3 reason: transitive property of equality c. statement: m 1 = m 2 reason: subtraction property of equality d. statement: m 1 + m 2 = m 2 + m 3 reason: substitution property of equality e. statement: 2(m 1) = m 2 + m 3 reason: substitution property of equality

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me