Pretty EASY..1 + Tan2A = 1 + Sin2A/Cos2A= (Cos2A + Sin2A)/ Cos2A= 1/Cos2A (As cos2A + sin2A = 1)= Sec2ASimilarly, 1 + Cot2A = Cosec2ALHS: 1 + Tan2A / 1 + Cot2a= Sec2A/Cosec2A=Sin2A/Cos2A=Tan2A=1/Cot2ARHS: 1/Cot2ASince LHS=RHS; HENCE PROVED!Hope you understood! :)hope it will help you.
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