Verify which of the following are identities 1)1+ cos^ 2 theta cot^ 2 theta(1-sin^ 2 theta) =4 sec^ 2 theta 15cos theta * (1/(cos theta) - (cot theta)/(csc(theta))) = 15sin^2 theta 2 ) a. Only the first equation is an identity . b None of the equations are identities . c. Only the second equation is an identity d Both the equations are identities . Please select the best answer from the choices provided

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