3 cotA = 4 হলে, sinA =?
Solution
Correct Answer: Option B
দেয়া আছে,
3 cotA = 4
বা, cotA = 4/3
বা, cot2A = 16/9
বা, cosec2A - 1 = 16/9
বা, cosec2A = (16/9) + 1
বা, cosec2A = (16 + 9)/9
বা, cosec2A = 25/9
বা, cosec2A = (5/3)2
বা, cosecA = 5/3
বা, 1/sinA = 5/3
sinA = 3/5
3 cotA = 4
বা, cotA = 4/3
বা, cot2A = 16/9
বা, cosec2A - 1 = 16/9
বা, cosec2A = (16/9) + 1
বা, cosec2A = (16 + 9)/9
বা, cosec2A = 25/9
বা, cosec2A = (5/3)2
বা, cosecA = 5/3
বা, 1/sinA = 5/3
sinA = 3/5
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