ICSE Class 10 Answered
1st question please solve it !
![question image](http://images.topperlearning.com/topper/new-ate/top_mob15976655932120395481e5f73fc3-75de-4983-a7bb-6bdc538459ec.jpg)
Asked by shahbaaz.rocking | 17 Aug, 2020, 17:29: PM
![begin mathsize 16px style To space prove colon fraction numerator secA thin space minus space 1 over denominator secA space plus space 1 end fraction equals space fraction numerator 1 minus cosA over denominator 1 plus cosA end fraction
straight L. straight H. straight S equals fraction numerator secA thin space minus space 1 over denominator secA space plus space 1 end fraction
space space space space space space space space space space space equals fraction numerator begin display style 1 over cosA end style minus 1 over denominator 1 over cosA plus 1 end fraction
space space space space space space space space space space space space equals space fraction numerator begin display style fraction numerator 1 minus cosA over denominator cosA end fraction end style over denominator begin display style fraction numerator 1 plus cosA over denominator cosA end fraction end style end fraction
space space space space space space space space space space space space space equals fraction numerator 1 minus cosA over denominator 1 plus cosA end fraction equals space straight R. straight H. straight S end style](https://images.topperlearning.com/topper/tinymce/cache/ef1408c7b23e0fe12a2163c501453dff.png)
Answered by Yasmeen Khan | 17 Aug, 2020, 20:12: PM
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