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ICSE Class 10 Answered

Plz solve ques 51 urgently
Asked by lovemaan5500 | 14 Jan, 2018, 02:18: PM
Expert Answer
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
Answered by Sneha shidid | 16 Jan, 2018, 09:44: AM

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