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Question : 21 of 160
Marks:
+1,
-0
Solution:
[(1+cos‌)(1+cos‌) (1+cos‌)(1+cos‌) (1+cos‌)(1+cos‌) (1+cos‌)] [(1+cos‌)(1+cos‌) (1+cos‌)(1)(1−cos‌) (1+cos‌)(1−cos‌) Solve further,
=(1−cos2 )(1−cos2)(1−) =sin2×sin2× =(1−cos‌)(1−cos‌ ‌)× = (1−)×=
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