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Q.

tan40°+tan20°cot45°cot50°cot70°=

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a

-3

b

-13

c

13

d

3

answer is D.

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Detailed Solution

tan40°+tan20°1cot(90°40°)cot(90°20°)

=tan40°+tan20°1tan40°tan20°=tan(40°+20°)

=tan60°

=3

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