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is equal to
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a
1
b
2
c
3
d
4
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Correct option is D
3cosec20∘−sec20∘=3sin20∘−1cos20∘=3cos20∘−sin20∘sin20∘⋅cos20∘=432cos20∘−12sin20∘2sin20∘⋅cos20∘=4sin60∘cos20∘−cos60∘sin20∘sin40∘=4sin40∘sin40∘=4
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