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(1/cos)+(tan) = (1/cos)+(sin/cos) = (1+sinΘ) / cosΘ =
{{now we multiply it by (1-sinΘ)/(1-sinΘ)}}
= (1+sinΘ)(1-sinΘ) / cosΘ(1-sinΘ) = (1-sin^2) / cos(1-sin) = cos^2 / cos(1-sin) =
= (cosΘ)/(1-sinΘ)
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(1/cos)+(tan) = (1/cos)+(sin/cos) = (1+sinΘ) / cosΘ =
{{now we multiply it by (1-sinΘ)/(1-sinΘ)}}
= (1+sinΘ)(1-sinΘ) / cosΘ(1-sinΘ) = (1-sin^2) / cos(1-sin) = cos^2 / cos(1-sin) =
= (cosΘ)/(1-sinΘ)