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CBSE Class 10 Answered

1 sinA/(1-cosA)+tanA/(1+cosA)=secAcosecA+cotA
 
2.cotA=12/5 show that tan square A-sinsquare A=sin square A secsquare A
 
 
Asked by sananaubahar | 21 Jun, 2015, 07:08: PM
answered-by-expert Expert Answer
Please ask one query in one post. The explanation for the first question is given below.
1. space L H S equals fraction numerator sin A over denominator 1 minus cos A end fraction plus fraction numerator tan A over denominator 1 plus cos A end fraction equals fraction numerator sin A open parentheses 1 plus cos A close parentheses plus tan A open parentheses 1 minus cos A close parentheses over denominator 1 minus cos squared A end fraction equals fraction numerator sin A plus sin A cos A plus tan A minus sin A over denominator sin squared A end fraction equals fraction numerator sin A cos A plus tan A over denominator sin squared A end fraction equals fraction numerator sin A cos A over denominator sin squared A end fraction plus fraction numerator tan A over denominator sin squared A end fraction equals fraction numerator cos A over denominator sin A end fraction plus fraction numerator 1 over denominator sin A cos A end fraction equals c o t A plus s e c A cos e c A equals R H S space left parenthesis P r o v e d right parenthesis
Answered by satyajit samal | 22 Jun, 2015, 02:14: AM

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