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Step-by-step explanation:
1+(1-tanA/1-cotA)^2 = 1+(1 -tanA/1 -1 / tanA)^2
= 1+[(1-tanA)/tanA-1/tanA)]^2
=1+[(1-tanA)tanA/tanA-1]^2
cancelling 1-tanA and tanA-1
=1+(-tanA)^2
=1+Tan^2A
=sec^2A
=R.H.S
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