tan50°=2tan 10°+tan40°
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Step-by-step explanation:
take RHS ---------
tan10 + tan10 + tan 40
tan 10 + tan50(1-tan10tan40)
tan 10 + tan 50 - tan10tan40tan50
tan 10 (1-tan40tan50) + tan50
tan 10 () + tan 50
∵ tan90=1/0
∴ so tan10() + tan50=0
we will left with tan 50
thus LHS=RHS hence proved
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