Math, asked by anshika8439, 1 year ago

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Answered by Anonymous
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ANSWER :
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1 ). ( 1 - Cos² θ ) cosec² θ = 1.

By using identity,

[ sin² θ + cos² θ = 1 ]
[ sin² θ = 1 - Cos² θ ]

L. H. S. = sin² θ × cosec² θ

=> sin² θ × 1 / sin² θ

=> 1 = R. H. S.
______________________________

2 ). L. H. S. = ( 1 - Cos² θ) sec² θ

=> sin² θ × 1 / Cos² θ

=> sin² θ / Cos² θ

=> tan² θ = R. H. S.
______________________________

3 ). ( i ).

L. H. S. =Sin² θ + [ 1 / ( 1 + tan² θ)]

By using identity,

[ 1 + tan² θ = sec ² θ ]

=> sin² θ + ( 1 / sec² θ )

=> sin² θ + ( 1 / 1 / Cos² θ ) [ sec² θ = 1 / cos² θ]

=> sin² θ + cos² θ

=> 1 . = R. H. S.
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