Teaching EMRS TGT Mock Test 2023 Mathematics Trigonometry Trigonometric Functions

जब 0° ≤ θ ≤ 90° तो 2cos2 θ + sin θ - 2 = 0 का समाधान क्या है?

1
= 30° 
2
= ६०° या ४५°
3
θ = ४५° या ९०°
4
= ६०° या ९०°
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