In the adjoining figure, ABC is a right angled triangle right angled at B; AB = 24 cm and BC = 7 cm. Using the figure answer the question. The value of sec A is 1. 24/7 2. 7/24 3. 25/24 4. 25/7

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If x = a cos θ + b sin θ and y = a sin θ - b cos θ, prove that x² + y² = a² + b².