Solve all your doubts with Teachoo Black (new monthly pack available now!)
Example 14 - Chapter 8 Class 10 Introduction to Trignometry (Term 1)
Last updated at Dec. 24, 2019 by Teachoo
Examples
Example 1
Example 2 Important
Example 3
Example 4
Example 5 Important
Example 6
Example 7 Important
Example 8 Important
Example 9 Deleted for CBSE Board 2023 Exams
Example 10 Important Deleted for CBSE Board 2023 Exams
Example 11 Important Deleted for CBSE Board 2023 Exams
Example 12
Example 13 Important
Example 14 Important You are here
Example 15 Important
Chapter 8 Class 10 Introduction to Trignometry
Serial order wise
Transcript
Example 14 Prove that cot cos /cot + cos =( 1)/( + 1) Taking L.H.S cot cos /cot + cos Writing everything in terms of sin A and cos A = (cos /sin cos )/(cos /sin + cos ) = cos cos sin /(sin /(cos + cos sin /sin )) = ( ( sin ))/(( + sin )) = ( (1 sin ))/( (1 + sin )) = ( (1 sin ))/( (1 + sin )) Dividing sin A on numerator and denominator = ( ((1 sin ))/( ))/( ((1 + sin ))/( )) = ( 1/( ) ( )/( ))/(1/( ) + ( )/( )) = ( 1/( ) 1)/(1/( ) + 1) = ( 1)/( + 1) = R.H.S. So, L.H.S = R.H.S Hence proved
