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`(Sec Theta + Tan Theta )/( Sec Theta - Tan Theta ) = ( Sec Theta + Tan Theta )^2 = 1+2 Tan^2 Theta + 25 Sec Theta Tan Theta `

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Question

`(sec theta + tan theta )/( sec theta - tan theta ) = ( sec theta + tan theta )^2 = 1+2 tan^2 theta + 25 sec theta tan theta `

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Solution

Here, `(sec theta + tan theta ) /( sec theta - tan theta)`

      =`((sec theta + tan theta ) ( sec theta + tan theta))/(( sec theta - tan theta ) ( sec theta + tan theta ))`

      =` ((sec theta + tan theta )^2) /( sec^2 theta - tan^2 theta)`

      =`((sec theta + tan theta )^2)/1`

      =`(sec theta + tan theta )^2`

 Again , `(sec theta + tan theta )2`

      =` sec^2 theta + tan^2 theta + 2 sec theta  tan theta `

      =` 1+ tan^2 theta + tan^2 theta + 2 sec theta tan theta`

      =`1+2 tan^2 theta + 2 sec theta tan theta `

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Chapter 13: Trigonometric identities - Exercises 1

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R.S. Aggarwal Mathematics [English] Class 10
Chapter 13 Trigonometric identities
Exercises 1 | Q 26.2
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