p.t cot54÷tan36+tan20÷cot70=2
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=Cot54/tan36 + tan20/cot70 -2tan45
=As we know that cot (90-x)=tan x
=cot(90-36)/tan36 + tan(90-70)/cot70 - 2
=tan36/tan36 + cot70/cot70 - 2
=1+1-2
= 0
=As we know that cot (90-x)=tan x
=cot(90-36)/tan36 + tan(90-70)/cot70 - 2
=tan36/tan36 + cot70/cot70 - 2
=1+1-2
= 0
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