CBSE Class 11-science Answered
we assume that you want to prove 2tan10+tan40=tan50
consider tan 50= tan (10+40) = (tan 10+tan 40)/(1-tan 10tan 40)
so tan 50-tan 50tan10tan40 = tan 10+tan 40
tan 50-cot40tan10tan40 = tan 10+tan 40
so tan 50=tan 10+tan 40+tan10 =2tan10+tan40
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