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it should be Sec 70° in place of Cosec70° .
tan20° = Cot 70°
Cosec 70° = 1/Sin70°
Cot 20° = Tan70°
Sec 20° = Cosec 70° = 1/Sin70°
LHS
(Tan20/Cosec70°)^2 +( Cot 20° /Cosec70°)^2
(Cot70°/Cosec70°)^2 + ( Tan20°/Cosec70°)^2
Cos^2 70° + Sin^2 70°
1
RHS
1
LHS= RHS
proves
tan20° = Cot 70°
Cosec 70° = 1/Sin70°
Cot 20° = Tan70°
Sec 20° = Cosec 70° = 1/Sin70°
LHS
(Tan20/Cosec70°)^2 +( Cot 20° /Cosec70°)^2
(Cot70°/Cosec70°)^2 + ( Tan20°/Cosec70°)^2
Cos^2 70° + Sin^2 70°
1
RHS
1
LHS= RHS
proves
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