Question 868095
{{{ (1)/(1-sin(theta))  + (1)/(1+sin(theta)) =
(1+sin(theta))/((1-sin(theta))(1+sin(theta)))+(1-sin(theta))/((1+sin(theta))(1-sin(theta)))}}}
.
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{{{ (1)/(1-sin(theta))  + (1)/(1+sin(theta)) =
(1+sin(theta)+1-sin(theta))/((1-sin^2(theta)))}}}
.
.
{{{ (1)/(1-sin(theta))  + (1)/(1+sin(theta)) =
(2)/(cos^2(theta))}}}
.
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{{{ (1)/(1-sin(theta))  + (1)/(1+sin(theta)) =2sec^2(theta)}}}