If (cos²20° + cos²70°) / [2(sin²59° + sin²31°)] = 2/k, then k is equal toयदि (cos²20° + cos²70°) / [2(sin²59° + sin²31°)] = 2/k है, तो k बराबर है
यदि (cos²20° + cos²70°) / [2(sin²59° + sin²31°)] = 2/k है, तो k बराबर है
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Correct answer: (C) 44
Explanation
cos²70° = sin²20°, so the numerator is 1; sin²59° + sin²31° = 1, so the denominator is 2. Thus 1/2 = 2/k and k = 4.cos²70° = sin²20°, अतः अंश = 1; sin²59° + sin²31° = 1, अतः हर = 2। इस प्रकार 1/2 = 2/k और k = 4।