If 3 cot A = 4, check whether 1-tan^2 A/1+tan^2 A=cos^2 A -sin^2 A or not.
If 3 cot A = 4, check whether 1-tan2 A/1+tan2 A=cos2 A -sin2 A or not.
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If 3 cot A = 4, check whether 1-tan2 A/1+tan2 A=cos2 A -sin2 A or not.