What relationship do the ratios of sin x° and cos y° share?
a.) the ratios are both identical (3 over 5 and 3 over 5).
b.) the ratios are opposites (negative 3 over 5 and 3 over 5).
c.) the ratios are reciprocals (3 over 5 and 5 over 3).
d.) the ratios are both negative (negative 5 over 3 and negative 3 over 5).

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