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√2025.12 × √256.03 + √399.89 ×√(?) = 33.99 × 40.12 √2025 × √256 + √400 × √? = 33.99 × 40.12 45× 16 + 20 ×√(?) = 34 × 40 720 + 20 ×√(?) = 1360 20 ×√(?) = 1360 – 720 20 ×√(?) = 640 √(?) = 32 ? = 32 × 32 = 1024
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if 7 sin 2 x + 2 cos 2 x = 4 then find tan x
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