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Q.

tan69°+tan66°tan69°.tan66°=2k then k=

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a

1

b

1

c

3

d

12

answer is D.

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Detailed Solution

135=69+66

tan135=tan(69+66)

tan45=tan69+tan661tan69.tan66

1+tan69.tan66=tan69+tan66

1=tan69+tan66tan69.tan66

1=2k

k=12

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tan69°+tan66°−tan69°.tan66°=2k then k=