Q18 of 61 Page 217

=

We know that,


∴





Where, and






Hence,

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16

(1 + cot2θ)(1 – cosθ)(1 + cos θ) =

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(cos2θ – 1)(cot2θ + 1) + 1 =

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=

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9tan2θ – 9 sec2θ =