SSC IB ACIO Grade II Mock Test 2023 Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

यदि (cos2θ –1)(1 + tan2θ) + 2tan2θ = 1, 0° ≤ θ ≤ 90° तो θ का मान क्या है?

1
90° 
2
60°
3
30° 
4
45° 
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