solve tan^2A=3(secA-1)
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sec² A - 1 = 3 sec A - 3
sec² A - 3 sec A + 2 = 0
sec² A - 2 sec A - sec A + 2 =0
sec A (sec A - 2) - 1(sec A - 2 ) = 0
sec A = 1 (or) sec A = 2
A = 0° (or) A = 60°
sec² A - 3 sec A + 2 = 0
sec² A - 2 sec A - sec A + 2 =0
sec A (sec A - 2) - 1(sec A - 2 ) = 0
sec A = 1 (or) sec A = 2
A = 0° (or) A = 60°
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