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Using the difference formula on 45° and 30°, tan 15° is
A2 − √3
B√3 − 1
C2 + √3
D1/√3
Answer & Solution
Correct answer: A. 2 − √3
tan (45 − 30) = (1 − 1/√3)/(1 + 1/√3) = (√3 − 1)/(√3 + 1) = 2 − √3.
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