Evaluate:cot 54 /tan 36 +tan 20 /cot 70 -2 =0
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Answered by
46
tan(90-x) = cot(x)
so cot 54 /tan 36 = cot54/ cot 54 =1
||ly for tan20/cot70 = 1
so 1+1-2=0
hence proved
so cot 54 /tan 36 = cot54/ cot 54 =1
||ly for tan20/cot70 = 1
so 1+1-2=0
hence proved
Answered by
48
LHS= cot54/tan36 +tan20/cot70 - 2
=cot54/cot54 +tan20/tan20 - 2
=1 + 1 - 2
=0 = RHS
=cot54/cot54 +tan20/tan20 - 2
=1 + 1 - 2
=0 = RHS
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