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Grade: 10
        Prove that TanA/secA+1 +cotA/cosecA+1= cosecA+secA-secAtanA
3 years ago

Answers : (1)

Shaswata Biswas
132 Points
							
LHS = \frac{tanA}{secA+1} + \frac{cotA}{cosecA+1}
\frac{tanA(secA-1)}{(secA+1)(secA-1)} + \frac{cotA(cosecA-1)}{(cosecA+1)(cosecA-1)}
\frac{tanA(secA-1)}{sec^{2}A-1} + \frac{cotA(cosecA-1)}{cosec^{2}A-1}
\frac{tanA(secA-1)}{tan^{2}A} + \frac{cotA(cosecA-1)}{cot^{2}A}
\frac{secA-1}{tanA} + \frac{cosecA-1}{cotA}
\frac{secA}{tanA} - \frac{1}{tanA} + \frac{cosecA}{cotA} - \frac{1}{cotA}
cosecA + secA - [ \frac{1}{tanA} + \frac{1}{cotA}]
cosecA + secA - [ \frac{cosA}{sinA} + \frac{sinA}{cosA}]
cosecA + secA - [ \frac{cos^{2}A+ sin^{2}A}{sinAcosA}]
cosecA + secA - \frac{1}{sinAcosA}
cosecA + secA - secAcosecA
Here it should beTanA/(secA+1) + cotA/(cosecA+1) =  cosecA +secA -secAcosecA
Hence, Proved.
THANKS
 
3 years ago
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