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The logic followed here is: (480, 238, 484) → 480 − 238 = 242 × 2 = 484 Now checking the options: (a) 680−532 → 680 - 532 = 148 × 2 = 296 (incorrect) (b) 855−432 → 423 × 2 = 846 (correct) (c) 902 – 679 = 223 × 2 = 446 (incorrect) (d) 770 – 544 = 226 × 2 = 452 (incorrect) Hence, the correct answer is (b).
sin2 9 ° + sin2 10 ° + sin2 11 ° + sin2 12 ° + ……… + sin2 81 ° = ?
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Simplify the given equation: