Answers

2016-03-21T22:24:11+05:30
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
0
2016-03-21T22:24:50+05:30
LHS= cot54/tan36 +tan20/cot70 - 2
=cot54/cot54 +tan20/tan20 - 2
=1 + 1 - 2
=0 = RHS
1 1 1