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If $3cot^2x - 7 cosec^2x + 7 = 0,$ then the value of x( 0 ≤ x ≤ 90°) is : |
30° 0° 90° 60° |
90° |
3 cot²x - 7 cosec²x + 7 = 0 { cosec²x - cot²x = 1 } 3 (cosec²x - 1 ) - 7 cosec²x + 7 = 0 3cosec²x - 7 cosec²x + 4 = 0 - 4 cosec²x + 4 = 0 cosec x = 1 { we know, cosec 90º = 1 } So, x = 90º
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