prove that. tan 20 , tan 40, tan 50 , tan 70
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RHS=tan20 tan40 tan(90-20) tan (90-40). 1 divided cot 20 ,1 dived cot 40,cot 20 cot40. then cot 20 and cot 20 is cancel and cot 40 and cot 40 is cancel . finally result 1 =RHS proved
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