15.
tan 40° +2 tan 10°=cot x then x =
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Answer:
tan40 + 2 tan 10 = cot x
tan ( 40 + 2* 10 ) = cot x
tan ( 40 + 20 ) = cot x
tan 60 = cot x
√3 = cot x
cot = 30°
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