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7. Trigonometry
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Q18 of 61 Page 217

=

We know that,


∴





Where, and






Hence,

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16

(1 + cot2θ)(1 – cosθ)(1 + cos θ) =

17

(cos2θ – 1)(cot2θ + 1) + 1 =

19

=

20

9tan2θ – 9 sec2θ =

Questions · 61
7. Trigonometry
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