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Question

The value of tan70tan20tan50 is

A
2
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B
1
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C
0
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D
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Solution

The correct option is A 2
tan70tan20tan50
=tan70tan20tan(7020)
=tan70tan20tan70tan20×(1+tan70tan20)
=1+tan70tan20
=1+tan70cot70
=1+1=2

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