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## Answers

so cot 54 /tan 36 = cot54/ cot 54 =1

||ly for tan20/cot70 = 1

so 1+1-2=0

hence proved

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