Which of the following options represents a logical first st

Which of the following options represents a logical first step that can be used to prove the trigonometric identity 1/1 - sin(x) + 1/1 + sin(x) - 2/cos^2x? 1/1 - sin(x) = 2/cos^2(x) - 1/1 +sin(x) 1 + sin(x) + 1 - sin(x)/1 - sin^2(x) = 2/cos^2(x) 1/1 + sin(x) = 2/cos^2(x) - 1/1 - sin(x) 1/1/1 - sin(x) + 1/1 + sin(x) = 1/2/cos^2(x)

Solution

the second option is correct because 1st we have to take the LCM of the denominator and that is what been done in the second option.

the lcm of 1-sinx and 1+sinx = 1-sin^2x