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Q.238 :  यदि m tan(θ-30°) = n tan (θ+120°), तो cos2θ = ?

(a) m + n / m - n
(b) m - n / m + n
(c) m - n / 2(m + n)
(d) m + n / 2(m - n
View Answer
Answer :m + n / 2(m - n

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