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If x = a cos , y = b sin , then b2 x 2 + a2 y 2 – a 2b 2 is equal to |
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Answer» X = acos∅ y = bsin∅ → b²x² + a²y² - a²b² = b²a²cos²∅ + a²b²sin²∅ - a²b² = a²b²(cos²∅ + sin²∅) - a²b² = a²b² - a²b² = 0 Identity USED : cos²∅ + sin²∅ = 1 |
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