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Example 11 - Chapter 8 Class 10 Introduction to Trignometry
Last updated at May 29, 2023 by Teachoo
Chapter 8 Class 10 Introduction to Trignometry
Concept wise
- Finding sin cos tan
- Finding sin cos when sides of a triangle are given
- Finding ratios when other ratios are given
- Finding values of expressions
- Proving
- Trignometric ratios of Specific Angles - Evaluating
- Trignometric ratios of complementry angles
- Expressing ratios in other ratios
-
Evaluating using Trignometric Identities
Transcript
Example 11 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
