Easy one

Algebra Level pending

$\cot^{2}A (1-3\sec A+2\sec^{2}A) =1$ where, $A>90$

Find $A$

300 180 120 270

by Kartik Agarwal , 20, India

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1 solution

Kartik Agarwal
Jan 10, 2016

Cos60=Cos300

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