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Q.

E = 4 cos28° cos 29° sin 33° + cos 66° - cos 58° - cos 56° = 

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An Intiative by Sri Chaitanya

a

2

b

1

c

-1

d

0

answer is B.

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Detailed Solution

4cos28°cos29°sin33° =22cos28°cos29°sin33° =2cos57°+cos1°sin33° =2cos57°+sin33°+2cos1°sin33° =sin90°-sin24°+sin34°+sin32° =1-cos66°+cos56°+cos58°

                                                       :E=1

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