ICSE Class 10 Answered
Plz solve ques 51 urgently
![question image](https://images.topperlearning.com/topper/new-ate/3234907329232311rps20180114141657.jpg)
Asked by lovemaan5500 | 14 Jan, 2018, 14:18: PM
![begin mathsize 16px style left parenthesis straight i right parenthesis
sec squared straight theta minus 2 tanθ equals 0
Using space sec squared straight theta equals 1 plus tan squared straight theta
1 plus tan squared straight theta minus 2 tanθ equals 0
Let space tanθ equals straight x
1 plus straight x squared minus 2 straight x equals 0
left parenthesis straight x minus 1 right parenthesis squared equals 0
straight x minus 1 equals 0
straight x equals 1
tanθ equals 1
straight theta equals 45 degree
left parenthesis iii right parenthesis
2 cos 3 straight theta equals 1
cos 3 straight theta equals 1 half
3 straight theta equals 60 degree
straight theta equals 20 degree
end style](https://images.topperlearning.com/topper/tinymce/cache/a1edea17b0d52c8e29fb9d7f3d867ad3.png)
Answered by Sneha shidid | 16 Jan, 2018, 09:44: AM
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