Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

যদি 8 sec2x – 7 tan2 x = 11 হয় এবং 00 ≤ x ≤ 900  হয়, তাহলে x = এর মান কতো হবে ?

1
300
2
450
3
60 0
4
900

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